refactor: `tests` is now `tests/libgit2`

Like we want to separate libgit2 and utility source code, we want to
separate libgit2 and utility tests.  Start by moving all the tests into
libgit2.

43 files changed, 8378 insertions, 0 deletions

diff --git a/tests/libgit2/core/array.c b/tests/libgit2/core/array.c
new file mode 100644
index 000000000..8e626a506
--- /dev/null
+++ b/tests/libgit2/core/array.c
@@ -0,0 +1,57 @@
+#include "clar_libgit2.h"
+#include "array.h"
+
+static int int_lookup(const void *k, const void *a)
+{
+	const int *one = (const int *)k;
+	int *two = (int *)a;
+
+	return *one - *two;
+}
+
+#define expect_pos(k, n, ret) \
+	key = (k); \
+	cl_assert_equal_i((ret), \
+		git_array_search(&p, integers, int_lookup, &key)); \
+	cl_assert_equal_i((n), p);
+
+void test_core_array__bsearch2(void)
+{
+	git_array_t(int) integers = GIT_ARRAY_INIT;
+	int *i, key;
+	size_t p;
+
+	i = git_array_alloc(integers); *i = 2;
+	i = git_array_alloc(integers); *i = 3;
+	i = git_array_alloc(integers); *i = 5;
+	i = git_array_alloc(integers); *i = 7;
+	i = git_array_alloc(integers); *i = 7;
+	i = git_array_alloc(integers); *i = 8;
+	i = git_array_alloc(integers); *i = 13;
+	i = git_array_alloc(integers); *i = 21;
+	i = git_array_alloc(integers); *i = 25;
+	i = git_array_alloc(integers); *i = 42;
+	i = git_array_alloc(integers); *i = 69;
+	i = git_array_alloc(integers); *i = 121;
+	i = git_array_alloc(integers); *i = 256;
+	i = git_array_alloc(integers); *i = 512;
+	i = git_array_alloc(integers); *i = 513;
+	i = git_array_alloc(integers); *i = 514;
+	i = git_array_alloc(integers); *i = 516;
+	i = git_array_alloc(integers); *i = 516;
+	i = git_array_alloc(integers); *i = 517;
+
+	/* value to search for, expected position, return code */
+	expect_pos(3, 1, GIT_OK);
+	expect_pos(2, 0, GIT_OK);
+	expect_pos(1, 0, GIT_ENOTFOUND);
+	expect_pos(25, 8, GIT_OK);
+	expect_pos(26, 9, GIT_ENOTFOUND);
+	expect_pos(42, 9, GIT_OK);
+	expect_pos(50, 10, GIT_ENOTFOUND);
+	expect_pos(68, 10, GIT_ENOTFOUND);
+	expect_pos(256, 12, GIT_OK);
+
+	git_array_clear(integers);
+}
+
diff --git a/tests/libgit2/core/assert.c b/tests/libgit2/core/assert.c
new file mode 100644
index 000000000..ef75624b9
--- /dev/null
+++ b/tests/libgit2/core/assert.c
@@ -0,0 +1,94 @@
+#ifdef GIT_ASSERT_HARD
+# undef GIT_ASSERT_HARD
+#endif
+
+#define GIT_ASSERT_HARD 0
+
+#include "clar_libgit2.h"
+
+static const char *hello_world = "hello, world";
+static const char *fail = "FAIL";
+
+static int dummy_fn(const char *myarg)
+{
+	GIT_ASSERT_ARG(myarg);
+	GIT_ASSERT_ARG(myarg != hello_world);
+	return 0;
+}
+
+static const char *fn_returns_string(const char *myarg)
+{
+	GIT_ASSERT_ARG_WITH_RETVAL(myarg, fail);
+	GIT_ASSERT_ARG_WITH_RETVAL(myarg != hello_world, fail);
+
+	return myarg;
+}
+
+static int bad_math(void)
+{
+	GIT_ASSERT(1 + 1 == 3);
+	return 42;
+}
+
+static const char *bad_returns_string(void)
+{
+	GIT_ASSERT_WITH_RETVAL(1 + 1 == 3, NULL);
+	return hello_world;
+}
+
+void test_core_assert__argument(void)
+{
+	cl_git_fail(dummy_fn(NULL));
+	cl_assert(git_error_last());
+	cl_assert_equal_i(GIT_ERROR_INVALID, git_error_last()->klass);
+	cl_assert_equal_s("invalid argument: 'myarg'", git_error_last()->message);
+
+	cl_git_fail(dummy_fn(hello_world));
+	cl_assert(git_error_last());
+	cl_assert_equal_i(GIT_ERROR_INVALID, git_error_last()->klass);
+	cl_assert_equal_s("invalid argument: 'myarg != hello_world'", git_error_last()->message);
+
+	cl_git_pass(dummy_fn("foo"));
+}
+
+void test_core_assert__argument_with_non_int_return_type(void)
+{
+	const char *foo = "foo";
+
+	cl_assert_equal_p(fail, fn_returns_string(NULL));
+	cl_assert_equal_i(GIT_ERROR_INVALID, git_error_last()->klass);
+	cl_assert_equal_s("invalid argument: 'myarg'", git_error_last()->message);
+
+	cl_assert_equal_p(fail, fn_returns_string(hello_world));
+	cl_assert_equal_i(GIT_ERROR_INVALID, git_error_last()->klass);
+	cl_assert_equal_s("invalid argument: 'myarg != hello_world'", git_error_last()->message);
+
+	cl_assert_equal_p(foo, fn_returns_string(foo));
+}
+
+void test_core_assert__argument_with_void_return_type(void)
+{
+	const char *foo = "foo";
+
+	git_error_clear();
+	fn_returns_string(hello_world);
+	cl_assert_equal_i(GIT_ERROR_INVALID, git_error_last()->klass);
+	cl_assert_equal_s("invalid argument: 'myarg != hello_world'", git_error_last()->message);
+
+	git_error_clear();
+	cl_assert_equal_p(foo, fn_returns_string(foo));
+	cl_assert_equal_p(NULL, git_error_last());
+}
+
+void test_core_assert__internal(void)
+{
+	cl_git_fail(bad_math());
+	cl_assert(git_error_last());
+	cl_assert_equal_i(GIT_ERROR_INTERNAL, git_error_last()->klass);
+	cl_assert_equal_s("unrecoverable internal error: '1 + 1 == 3'", git_error_last()->message);
+
+	cl_assert_equal_p(NULL, bad_returns_string());
+	cl_assert(git_error_last());
+	cl_assert_equal_i(GIT_ERROR_INTERNAL, git_error_last()->klass);
+	cl_assert_equal_s("unrecoverable internal error: '1 + 1 == 3'", git_error_last()->message);
+}
diff --git a/tests/libgit2/core/bitvec.c b/tests/libgit2/core/bitvec.c
new file mode 100644
index 000000000..48d7b99f0
--- /dev/null
+++ b/tests/libgit2/core/bitvec.c
@@ -0,0 +1,64 @@
+#include "clar_libgit2.h"
+#include "bitvec.h"
+
+#if 0
+static void print_bitvec(git_bitvec *bv)
+{
+	int b;
+
+	if (!bv->length) {
+		for (b = 63; b >= 0; --b)
+			fprintf(stderr, "%d", (bv->u.bits & (1ul << b)) ? 1 : 0);
+	} else {
+		for (b = bv->length * 8; b >= 0; --b)
+			fprintf(stderr, "%d", (bv->u.ptr[b >> 3] & (b & 0x0ff)) ? 1 : 0);
+	}
+	fprintf(stderr, "\n");
+}
+#endif
+
+static void set_some_bits(git_bitvec *bv, size_t length)
+{
+	size_t i;
+
+	for (i = 0; i < length; ++i) {
+		if (i % 3 == 0 || i % 7 == 0)
+			git_bitvec_set(bv, i, true);
+	}
+}
+
+static void check_some_bits(git_bitvec *bv, size_t length)
+{
+	size_t i;
+
+	for (i = 0; i < length; ++i)
+		cl_assert_equal_b(i % 3 == 0 || i % 7 == 0, git_bitvec_get(bv, i));
+}
+
+void test_core_bitvec__0(void)
+{
+	git_bitvec bv;
+
+	cl_git_pass(git_bitvec_init(&bv, 32));
+	set_some_bits(&bv, 16);
+	check_some_bits(&bv, 16);
+	git_bitvec_clear(&bv);
+	set_some_bits(&bv, 32);
+	check_some_bits(&bv, 32);
+	git_bitvec_clear(&bv);
+	set_some_bits(&bv, 64);
+	check_some_bits(&bv, 64);
+	git_bitvec_free(&bv);
+
+	cl_git_pass(git_bitvec_init(&bv, 128));
+	set_some_bits(&bv, 32);
+	check_some_bits(&bv, 32);
+	set_some_bits(&bv, 128);
+	check_some_bits(&bv, 128);
+	git_bitvec_free(&bv);
+
+	cl_git_pass(git_bitvec_init(&bv, 4000));
+	set_some_bits(&bv, 4000);
+	check_some_bits(&bv, 4000);
+	git_bitvec_free(&bv);
+}
diff --git a/tests/libgit2/core/buf.c b/tests/libgit2/core/buf.c
new file mode 100644
index 000000000..3959fa883
--- /dev/null
+++ b/tests/libgit2/core/buf.c
@@ -0,0 +1,54 @@
+#include "clar_libgit2.h"
+#include "buf.h"
+
+void test_core_buf__sanitize(void)
+{
+	git_buf buf = { (char *)0x42, 0, 16 };
+
+	cl_git_pass(git_buf_sanitize(&buf));
+	cl_assert_equal_s(buf.ptr, "");
+	cl_assert_equal_i(buf.reserved, 0);
+	cl_assert_equal_i(buf.size, 0);
+
+	git_buf_dispose(&buf);
+}
+
+void test_core_buf__tostr(void)
+{
+	git_str str = GIT_STR_INIT;
+	git_buf buf = { (char *)0x42, 0, 16 };
+
+	cl_git_pass(git_buf_tostr(&str, &buf));
+
+	cl_assert_equal_s(buf.ptr, "");
+	cl_assert_equal_i(buf.reserved, 0);
+	cl_assert_equal_i(buf.size, 0);
+
+	cl_assert_equal_s(str.ptr, "");
+	cl_assert_equal_i(str.asize, 0);
+	cl_assert_equal_i(str.size, 0);
+
+	git_buf_dispose(&buf);
+	git_str_dispose(&str);
+}
+
+void test_core_buf__fromstr(void)
+{
+	git_str str = GIT_STR_INIT;
+	git_buf buf = { (char *)0x42, 0, 16 };
+
+	cl_git_pass(git_buf_tostr(&str, &buf));
+	cl_git_pass(git_str_puts(&str, "Hello, world."));
+	cl_git_pass(git_buf_fromstr(&buf, &str));
+
+	cl_assert(buf.reserved > 14);
+	cl_assert_equal_i(buf.size, 13);
+	cl_assert_equal_s(buf.ptr, "Hello, world.");
+
+	cl_assert_equal_s(str.ptr, "");
+	cl_assert_equal_i(str.asize, 0);
+	cl_assert_equal_i(str.size, 0);
+
+	git_buf_dispose(&buf);
+	git_str_dispose(&str);
+}
diff --git a/tests/libgit2/core/copy.c b/tests/libgit2/core/copy.c
new file mode 100644
index 000000000..6d22b503d
--- /dev/null
+++ b/tests/libgit2/core/copy.c
@@ -0,0 +1,153 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+#include "posix.h"
+
+void test_core_copy__file(void)
+{
+	struct stat st;
+	const char *content = "This is some stuff to copy\n";
+
+	cl_git_mkfile("copy_me", content);
+
+	cl_git_pass(git_futils_cp("copy_me", "copy_me_two", 0664));
+
+	cl_git_pass(git_fs_path_lstat("copy_me_two", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert(strlen(content) == (size_t)st.st_size);
+
+	cl_git_pass(p_unlink("copy_me_two"));
+	cl_git_pass(p_unlink("copy_me"));
+}
+
+void test_core_copy__file_in_dir(void)
+{
+	struct stat st;
+	const char *content = "This is some other stuff to copy\n";
+
+	cl_git_pass(git_futils_mkdir("an_dir/in_a_dir", 0775, GIT_MKDIR_PATH));
+	cl_git_mkfile("an_dir/in_a_dir/copy_me", content);
+	cl_assert(git_fs_path_isdir("an_dir"));
+
+	cl_git_pass(git_futils_mkpath2file
+		("an_dir/second_dir/and_more/copy_me_two", 0775));
+
+	cl_git_pass(git_futils_cp
+		("an_dir/in_a_dir/copy_me",
+		 "an_dir/second_dir/and_more/copy_me_two",
+		 0664));
+
+	cl_git_pass(git_fs_path_lstat("an_dir/second_dir/and_more/copy_me_two", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert(strlen(content) == (size_t)st.st_size);
+
+	cl_git_pass(git_futils_rmdir_r("an_dir", NULL, GIT_RMDIR_REMOVE_FILES));
+	cl_assert(!git_fs_path_isdir("an_dir"));
+}
+
+#ifndef GIT_WIN32
+static void assert_hard_link(const char *path)
+{
+	/* we assert this by checking that there's more than one link to the file */
+	struct stat st;
+
+	cl_assert(git_fs_path_isfile(path));
+	cl_git_pass(p_stat(path, &st));
+	cl_assert(st.st_nlink > 1);
+}
+#endif
+
+void test_core_copy__tree(void)
+{
+	struct stat st;
+	const char *content = "File content\n";
+
+	cl_git_pass(git_futils_mkdir("src/b", 0775, GIT_MKDIR_PATH));
+	cl_git_pass(git_futils_mkdir("src/c/d", 0775, GIT_MKDIR_PATH));
+	cl_git_pass(git_futils_mkdir("src/c/e", 0775, GIT_MKDIR_PATH));
+
+	cl_git_mkfile("src/f1", content);
+	cl_git_mkfile("src/b/f2", content);
+	cl_git_mkfile("src/c/f3", content);
+	cl_git_mkfile("src/c/d/f4", content);
+	cl_git_mkfile("src/c/d/.f5", content);
+
+#ifndef GIT_WIN32
+	cl_assert(p_symlink("../../b/f2", "src/c/d/l1") == 0);
+#endif
+
+	cl_assert(git_fs_path_isdir("src"));
+	cl_assert(git_fs_path_isdir("src/b"));
+	cl_assert(git_fs_path_isdir("src/c/d"));
+	cl_assert(git_fs_path_isfile("src/c/d/f4"));
+
+	/* copy with no empty dirs, yes links, no dotfiles, no overwrite */
+
+	cl_git_pass(
+		git_futils_cp_r("src", "t1", GIT_CPDIR_COPY_SYMLINKS, 0) );
+
+	cl_assert(git_fs_path_isdir("t1"));
+	cl_assert(git_fs_path_isdir("t1/b"));
+	cl_assert(git_fs_path_isdir("t1/c"));
+	cl_assert(git_fs_path_isdir("t1/c/d"));
+	cl_assert(!git_fs_path_isdir("t1/c/e"));
+
+	cl_assert(git_fs_path_isfile("t1/f1"));
+	cl_assert(git_fs_path_isfile("t1/b/f2"));
+	cl_assert(git_fs_path_isfile("t1/c/f3"));
+	cl_assert(git_fs_path_isfile("t1/c/d/f4"));
+	cl_assert(!git_fs_path_isfile("t1/c/d/.f5"));
+
+	cl_git_pass(git_fs_path_lstat("t1/c/f3", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert(strlen(content) == (size_t)st.st_size);
+
+#ifndef GIT_WIN32
+	cl_git_pass(git_fs_path_lstat("t1/c/d/l1", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+#endif
+
+	cl_git_pass(git_futils_rmdir_r("t1", NULL, GIT_RMDIR_REMOVE_FILES));
+	cl_assert(!git_fs_path_isdir("t1"));
+
+	/* copy with empty dirs, no links, yes dotfiles, no overwrite */
+
+	cl_git_pass(
+		git_futils_cp_r("src", "t2", GIT_CPDIR_CREATE_EMPTY_DIRS | GIT_CPDIR_COPY_DOTFILES, 0) );
+
+	cl_assert(git_fs_path_isdir("t2"));
+	cl_assert(git_fs_path_isdir("t2/b"));
+	cl_assert(git_fs_path_isdir("t2/c"));
+	cl_assert(git_fs_path_isdir("t2/c/d"));
+	cl_assert(git_fs_path_isdir("t2/c/e"));
+
+	cl_assert(git_fs_path_isfile("t2/f1"));
+	cl_assert(git_fs_path_isfile("t2/b/f2"));
+	cl_assert(git_fs_path_isfile("t2/c/f3"));
+	cl_assert(git_fs_path_isfile("t2/c/d/f4"));
+	cl_assert(git_fs_path_isfile("t2/c/d/.f5"));
+
+#ifndef GIT_WIN32
+	cl_git_fail(git_fs_path_lstat("t2/c/d/l1", &st));
+#endif
+
+	cl_git_pass(git_futils_rmdir_r("t2", NULL, GIT_RMDIR_REMOVE_FILES));
+	cl_assert(!git_fs_path_isdir("t2"));
+
+#ifndef GIT_WIN32
+	cl_git_pass(git_futils_cp_r("src", "t3", GIT_CPDIR_CREATE_EMPTY_DIRS | GIT_CPDIR_LINK_FILES, 0));
+	cl_assert(git_fs_path_isdir("t3"));
+
+	cl_assert(git_fs_path_isdir("t3"));
+	cl_assert(git_fs_path_isdir("t3/b"));
+	cl_assert(git_fs_path_isdir("t3/c"));
+	cl_assert(git_fs_path_isdir("t3/c/d"));
+	cl_assert(git_fs_path_isdir("t3/c/e"));
+
+	assert_hard_link("t3/f1");
+	assert_hard_link("t3/b/f2");
+	assert_hard_link("t3/c/f3");
+	assert_hard_link("t3/c/d/f4");
+#endif
+
+	cl_git_pass(git_futils_rmdir_r("src", NULL, GIT_RMDIR_REMOVE_FILES));
+}
diff --git a/tests/libgit2/core/dirent.c b/tests/libgit2/core/dirent.c
new file mode 100644
index 000000000..2419ec7ab
--- /dev/null
+++ b/tests/libgit2/core/dirent.c
@@ -0,0 +1,306 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+
+typedef struct name_data {
+	int count; /* return count */
+	char *name; /* filename		*/
+} name_data;
+
+typedef struct walk_data {
+	char *sub;		/* sub-directory name */
+	name_data *names; /* name state data	*/
+	git_str path;
+} walk_data;
+
+
+static char *top_dir = "dir-walk";
+static walk_data *state_loc;
+
+static void setup(walk_data *d)
+{
+	name_data *n;
+
+	cl_must_pass(p_mkdir(top_dir, 0777));
+
+	cl_must_pass(p_chdir(top_dir));
+
+	if (strcmp(d->sub, ".") != 0)
+		cl_must_pass(p_mkdir(d->sub, 0777));
+
+	cl_git_pass(git_str_sets(&d->path, d->sub));
+
+	state_loc = d;
+
+	for (n = d->names; n->name; n++) {
+		git_file fd = p_creat(n->name, 0666);
+		cl_assert(fd >= 0);
+		p_close(fd);
+		n->count = 0;
+	}
+}
+
+static void dirent_cleanup__cb(void *_d)
+{
+	walk_data *d = _d;
+	name_data *n;
+
+	for (n = d->names; n->name; n++) {
+		cl_must_pass(p_unlink(n->name));
+	}
+
+	if (strcmp(d->sub, ".") != 0)
+		cl_must_pass(p_rmdir(d->sub));
+
+	cl_must_pass(p_chdir(".."));
+
+	cl_must_pass(p_rmdir(top_dir));
+
+	git_str_dispose(&d->path);
+}
+
+static void check_counts(walk_data *d)
+{
+	name_data *n;
+
+	for (n = d->names; n->name; n++) {
+		cl_assert(n->count == 1);
+	}
+}
+
+static int update_count(name_data *data, const char *name)
+{
+	name_data *n;
+
+	for (n = data; n->name; n++) {
+		if (!strcmp(n->name, name)) {
+			n->count++;
+			return 0;
+		}
+	}
+
+	return GIT_ERROR;
+}
+
+static int one_entry(void *state, git_str *path)
+{
+	walk_data *d = (walk_data *) state;
+
+	if (state != state_loc)
+		return GIT_ERROR;
+
+	if (path != &d->path)
+		return GIT_ERROR;
+
+	return update_count(d->names, path->ptr);
+}
+
+
+static name_data dot_names[] = {
+	{ 0, "./a" },
+	{ 0, "./asdf" },
+	{ 0, "./pack-foo.pack" },
+	{ 0, NULL }
+};
+static walk_data dot = {
+	".",
+	dot_names,
+	GIT_STR_INIT
+};
+
+/* make sure that the '.' folder is not traversed */
+void test_core_dirent__dont_traverse_dot(void)
+{
+	cl_set_cleanup(&dirent_cleanup__cb, &dot);
+	setup(&dot);
+
+	cl_git_pass(git_fs_path_direach(&dot.path, 0, one_entry, &dot));
+
+	check_counts(&dot);
+}
+
+
+static name_data sub_names[] = {
+	{ 0, "sub/a" },
+	{ 0, "sub/asdf" },
+	{ 0, "sub/pack-foo.pack" },
+	{ 0, NULL }
+};
+static walk_data sub = {
+	"sub",
+	sub_names,
+	GIT_STR_INIT
+};
+
+/* traverse a subfolder */
+void test_core_dirent__traverse_subfolder(void)
+{
+	cl_set_cleanup(&dirent_cleanup__cb, &sub);
+	setup(&sub);
+
+	cl_git_pass(git_fs_path_direach(&sub.path, 0, one_entry, &sub));
+
+	check_counts(&sub);
+}
+
+
+static walk_data sub_slash = {
+	"sub/",
+	sub_names,
+	GIT_STR_INIT
+};
+
+/* traverse a slash-terminated subfolder */
+void test_core_dirent__traverse_slash_terminated_folder(void)
+{
+	cl_set_cleanup(&dirent_cleanup__cb, &sub_slash);
+	setup(&sub_slash);
+
+	cl_git_pass(git_fs_path_direach(&sub_slash.path, 0, one_entry, &sub_slash));
+
+	check_counts(&sub_slash);
+}
+
+
+static name_data empty_names[] = {
+	{ 0, NULL }
+};
+static walk_data empty = {
+	"empty",
+	empty_names,
+	GIT_STR_INIT
+};
+
+/* make sure that empty folders are not traversed */
+void test_core_dirent__dont_traverse_empty_folders(void)
+{
+	cl_set_cleanup(&dirent_cleanup__cb, &empty);
+	setup(&empty);
+
+	cl_git_pass(git_fs_path_direach(&empty.path, 0, one_entry, &empty));
+
+	check_counts(&empty);
+
+	/* make sure callback not called */
+	cl_assert(git_fs_path_is_empty_dir(empty.path.ptr));
+}
+
+static name_data odd_names[] = {
+	{ 0, "odd/.a" },
+	{ 0, "odd/..c" },
+	/* the following don't work on cygwin/win32 */
+	/* { 0, "odd/.b." }, */
+	/* { 0, "odd/..d.." }, */
+	{ 0, NULL }
+};
+static walk_data odd = {
+	"odd",
+	odd_names,
+	GIT_STR_INIT
+};
+
+/* make sure that strange looking filenames ('..c') are traversed */
+void test_core_dirent__traverse_weird_filenames(void)
+{
+	cl_set_cleanup(&dirent_cleanup__cb, &odd);
+	setup(&odd);
+
+	cl_git_pass(git_fs_path_direach(&odd.path, 0, one_entry, &odd));
+
+	check_counts(&odd);
+}
+
+/* test filename length limits */
+void test_core_dirent__length_limits(void)
+{
+	char *big_filename = (char *)git__malloc(FILENAME_MAX + 1);
+	memset(big_filename, 'a', FILENAME_MAX + 1);
+	big_filename[FILENAME_MAX] = 0;
+
+	cl_must_fail(p_creat(big_filename, 0666));
+
+	git__free(big_filename);
+}
+
+void test_core_dirent__empty_dir(void)
+{
+	cl_must_pass(p_mkdir("empty_dir", 0777));
+	cl_assert(git_fs_path_is_empty_dir("empty_dir"));
+
+	cl_git_mkfile("empty_dir/content", "whatever\n");
+	cl_assert(!git_fs_path_is_empty_dir("empty_dir"));
+	cl_assert(!git_fs_path_is_empty_dir("empty_dir/content"));
+
+	cl_must_pass(p_unlink("empty_dir/content"));
+
+	cl_must_pass(p_mkdir("empty_dir/content", 0777));
+	cl_assert(!git_fs_path_is_empty_dir("empty_dir"));
+	cl_assert(git_fs_path_is_empty_dir("empty_dir/content"));
+
+	cl_must_pass(p_rmdir("empty_dir/content"));
+
+	cl_must_pass(p_rmdir("empty_dir"));
+}
+
+static void handle_next(git_fs_path_diriter *diriter, walk_data *walk)
+{
+	const char *fullpath, *filename;
+	size_t fullpath_len, filename_len;
+
+	cl_git_pass(git_fs_path_diriter_fullpath(&fullpath, &fullpath_len, diriter));
+	cl_git_pass(git_fs_path_diriter_filename(&filename, &filename_len, diriter));
+
+	cl_assert_equal_strn(fullpath, "sub/", 4);
+	cl_assert_equal_s(fullpath+4, filename);
+
+	update_count(walk->names, fullpath);
+}
+
+/* test directory iterator */
+void test_core_dirent__diriter_with_fullname(void)
+{
+	git_fs_path_diriter diriter = GIT_FS_PATH_DIRITER_INIT;
+	int error;
+
+	cl_set_cleanup(&dirent_cleanup__cb, &sub);
+	setup(&sub);
+
+	cl_git_pass(git_fs_path_diriter_init(&diriter, sub.path.ptr, 0));
+
+	while ((error = git_fs_path_diriter_next(&diriter)) == 0)
+		handle_next(&diriter, &sub);
+
+	cl_assert_equal_i(error, GIT_ITEROVER);
+
+	git_fs_path_diriter_free(&diriter);
+
+	check_counts(&sub);
+}
+
+void test_core_dirent__diriter_at_directory_root(void)
+{
+	git_fs_path_diriter diriter = GIT_FS_PATH_DIRITER_INIT;
+	const char *sandbox_path, *path;
+	char *root_path;
+	size_t path_len;
+	int root_offset, error;
+
+	sandbox_path = clar_sandbox_path();
+	cl_assert((root_offset = git_fs_path_root(sandbox_path)) >= 0);
+
+	cl_assert(root_path = git__calloc(1, root_offset + 2));
+	strncpy(root_path, sandbox_path, root_offset + 1);
+
+	cl_git_pass(git_fs_path_diriter_init(&diriter, root_path, 0));
+
+	while ((error = git_fs_path_diriter_next(&diriter)) == 0) {
+		cl_git_pass(git_fs_path_diriter_fullpath(&path, &path_len, &diriter));
+
+		cl_assert(path_len > (size_t)(root_offset + 1));
+		cl_assert(path[root_offset+1] != '/');
+	}
+
+	cl_assert_equal_i(error, GIT_ITEROVER);
+
+	git_fs_path_diriter_free(&diriter);
+	git__free(root_path);
+}
diff --git a/tests/libgit2/core/encoding.c b/tests/libgit2/core/encoding.c
new file mode 100644
index 000000000..6cec24679
--- /dev/null
+++ b/tests/libgit2/core/encoding.c
@@ -0,0 +1,42 @@
+#include "clar_libgit2.h"
+#include "varint.h"
+
+void test_core_encoding__decode(void)
+{
+	const unsigned char *buf = (unsigned char *)"AB";
+	size_t size;
+
+	cl_assert(git_decode_varint(buf, &size) == 65);
+	cl_assert(size == 1);
+
+	buf = (unsigned char *)"\xfe\xdc\xbaXY";
+	cl_assert(git_decode_varint(buf, &size) == 267869656);
+	cl_assert(size == 4);
+
+	buf = (unsigned char *)"\xaa\xaa\xfe\xdc\xbaXY";
+	cl_assert(git_decode_varint(buf, &size) == UINT64_C(1489279344088));
+	cl_assert(size == 6);
+
+	buf = (unsigned char *)"\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xfe\xdc\xbaXY";
+	cl_assert(git_decode_varint(buf, &size) == 0);
+	cl_assert(size == 0);
+
+}
+
+void test_core_encoding__encode(void)
+{
+	unsigned char buf[100];
+	cl_assert(git_encode_varint(buf, 100, 65) == 1);
+	cl_assert(buf[0] == 'A');
+
+	cl_assert(git_encode_varint(buf, 1, 1) == 1);
+	cl_assert(!memcmp(buf, "\x01", 1));
+
+	cl_assert(git_encode_varint(buf, 100, 267869656) == 4);
+	cl_assert(!memcmp(buf, "\xfe\xdc\xbaX", 4));
+
+	cl_assert(git_encode_varint(buf, 100, UINT64_C(1489279344088)) == 6);
+	cl_assert(!memcmp(buf, "\xaa\xaa\xfe\xdc\xbaX", 6));
+
+	cl_assert(git_encode_varint(buf, 1, UINT64_C(1489279344088)) == -1);
+}
diff --git a/tests/libgit2/core/env.c b/tests/libgit2/core/env.c
new file mode 100644
index 000000000..8ba9b9124
--- /dev/null
+++ b/tests/libgit2/core/env.c
@@ -0,0 +1,320 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+#include "sysdir.h"
+
+#ifdef GIT_WIN32
+#define NUM_VARS 5
+static const char *env_vars[NUM_VARS] = {
+	"HOME", "HOMEDRIVE", "HOMEPATH", "USERPROFILE", "PROGRAMFILES"
+};
+#else
+#define NUM_VARS 1
+static const char *env_vars[NUM_VARS] = { "HOME" };
+#endif
+
+static char *env_save[NUM_VARS];
+
+static char *home_values[] = {
+	"fake_home",
+	"f\xc3\xa1ke_h\xc3\xb5me", /* all in latin-1 supplement */
+	"f\xc4\x80ke_\xc4\xa4ome", /* latin extended */
+	"f\xce\xb1\xce\xba\xce\xb5_h\xce\xbfm\xce\xad",  /* having fun with greek */
+	"fa\xe0" "\xb8" "\x87" "e_\xe0" "\xb8" "\x99" "ome", /* thai characters */
+	"f\xe1\x9c\x80ke_\xe1\x9c\x91ome", /* tagalog characters */
+	"\xe1\xb8\x9f\xe1\xba\xa2" "ke_ho" "\xe1" "\xb9" "\x81" "e", /* latin extended additional */
+	"\xf0\x9f\x98\x98\xf0\x9f\x98\x82", /* emoticons */
+	NULL
+};
+
+void test_core_env__initialize(void)
+{
+	int i;
+	for (i = 0; i < NUM_VARS; ++i)
+		env_save[i] = cl_getenv(env_vars[i]);
+}
+
+static void set_global_search_path_from_env(void)
+{
+	cl_git_pass(git_sysdir_set(GIT_SYSDIR_GLOBAL, NULL));
+}
+
+static void set_system_search_path_from_env(void)
+{
+	cl_git_pass(git_sysdir_set(GIT_SYSDIR_SYSTEM, NULL));
+}
+
+void test_core_env__cleanup(void)
+{
+	int i;
+	char **val;
+
+	for (i = 0; i < NUM_VARS; ++i) {
+		cl_setenv(env_vars[i], env_save[i]);
+		git__free(env_save[i]);
+		env_save[i] = NULL;
+	}
+
+	/* these will probably have already been cleaned up, but if a test
+	 * fails, then it's probably good to try and clear out these dirs
+	 */
+	for (val = home_values; *val != NULL; val++) {
+		if (**val != '\0')
+			(void)p_rmdir(*val);
+	}
+
+	cl_sandbox_set_search_path_defaults();
+}
+
+static void setenv_and_check(const char *name, const char *value)
+{
+	char *check;
+
+	cl_git_pass(cl_setenv(name, value));
+	check = cl_getenv(name);
+
+	if (value)
+		cl_assert_equal_s(value, check);
+	else
+		cl_assert(check == NULL);
+
+	git__free(check);
+}
+
+void test_core_env__0(void)
+{
+	git_str path = GIT_STR_INIT, found = GIT_STR_INIT;
+	char testfile[16], tidx = '0';
+	char **val;
+	const char *testname = "testfile";
+	size_t testlen = strlen(testname);
+
+	strncpy(testfile, testname, sizeof(testfile));
+	cl_assert_equal_s(testname, testfile);
+
+	for (val = home_values; *val != NULL; val++) {
+
+		/* if we can't make the directory, let's just assume
+		 * we are on a filesystem that doesn't support the
+		 * characters in question and skip this test...
+		 */
+		if (p_mkdir(*val, 0777) != 0) {
+			*val = ""; /* mark as not created */
+			continue;
+		}
+
+		cl_git_pass(git_fs_path_prettify(&path, *val, NULL));
+
+		/* vary testfile name in each directory so accidentally leaving
+		 * an environment variable set from a previous iteration won't
+		 * accidentally make this test pass...
+		 */
+		testfile[testlen] = tidx++;
+		cl_git_pass(git_str_joinpath(&path, path.ptr, testfile));
+		cl_git_mkfile(path.ptr, "find me");
+		git_str_rtruncate_at_char(&path, '/');
+
+		cl_assert_equal_i(
+			GIT_ENOTFOUND, git_sysdir_find_global_file(&found, testfile));
+
+		setenv_and_check("HOME", path.ptr);
+		set_global_search_path_from_env();
+
+		cl_git_pass(git_sysdir_find_global_file(&found, testfile));
+
+		cl_setenv("HOME", env_save[0]);
+		set_global_search_path_from_env();
+
+		cl_assert_equal_i(
+			GIT_ENOTFOUND, git_sysdir_find_global_file(&found, testfile));
+
+#ifdef GIT_WIN32
+		setenv_and_check("HOMEDRIVE", NULL);
+		setenv_and_check("HOMEPATH", NULL);
+		setenv_and_check("USERPROFILE", path.ptr);
+		set_global_search_path_from_env();
+
+		cl_git_pass(git_sysdir_find_global_file(&found, testfile));
+
+		{
+			int root = git_fs_path_root(path.ptr);
+			char old;
+
+			if (root >= 0) {
+				setenv_and_check("USERPROFILE", NULL);
+				set_global_search_path_from_env();
+
+				cl_assert_equal_i(
+					GIT_ENOTFOUND, git_sysdir_find_global_file(&found, testfile));
+
+				old = path.ptr[root];
+				path.ptr[root] = '\0';
+				setenv_and_check("HOMEDRIVE", path.ptr);
+				path.ptr[root] = old;
+				setenv_and_check("HOMEPATH", &path.ptr[root]);
+				set_global_search_path_from_env();
+
+				cl_git_pass(git_sysdir_find_global_file(&found, testfile));
+			}
+		}
+#endif
+
+		(void)p_rmdir(*val);
+	}
+
+	git_str_dispose(&path);
+	git_str_dispose(&found);
+}
+
+
+void test_core_env__1(void)
+{
+	git_str path = GIT_STR_INIT;
+
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sysdir_find_global_file(&path, "nonexistentfile"));
+
+	cl_git_pass(cl_setenv("HOME", "doesnotexist"));
+#ifdef GIT_WIN32
+	cl_git_pass(cl_setenv("HOMEPATH", "doesnotexist"));
+	cl_git_pass(cl_setenv("USERPROFILE", "doesnotexist"));
+#endif
+	set_global_search_path_from_env();
+
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sysdir_find_global_file(&path, "nonexistentfile"));
+
+	cl_git_pass(cl_setenv("HOME", NULL));
+#ifdef GIT_WIN32
+	cl_git_pass(cl_setenv("HOMEPATH", NULL));
+	cl_git_pass(cl_setenv("USERPROFILE", NULL));
+#endif
+	set_global_search_path_from_env();
+	set_system_search_path_from_env();
+
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sysdir_find_global_file(&path, "nonexistentfile"));
+
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sysdir_find_system_file(&path, "nonexistentfile"));
+
+#ifdef GIT_WIN32
+	cl_git_pass(cl_setenv("PROGRAMFILES", NULL));
+	set_system_search_path_from_env();
+
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sysdir_find_system_file(&path, "nonexistentfile"));
+#endif
+
+	git_str_dispose(&path);
+}
+
+static void check_global_searchpath(
+	const char *path, int position, const char *file, git_str *temp)
+{
+	git_str out = GIT_STR_INIT;
+
+	/* build and set new path */
+	if (position < 0)
+		cl_git_pass(git_str_join(temp, GIT_PATH_LIST_SEPARATOR, path, "$PATH"));
+	else if (position > 0)
+		cl_git_pass(git_str_join(temp, GIT_PATH_LIST_SEPARATOR, "$PATH", path));
+	else
+		cl_git_pass(git_str_sets(temp, path));
+
+	cl_git_pass(git_libgit2_opts(
+		GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, temp->ptr));
+
+	/* get path and make sure $PATH expansion worked */
+	cl_git_pass(git_libgit2_opts(
+		GIT_OPT_GET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, &out));
+
+	if (position < 0)
+		cl_assert(git__prefixcmp(out.ptr, path) == 0);
+	else if (position > 0)
+		cl_assert(git__suffixcmp(out.ptr, path) == 0);
+	else
+		cl_assert_equal_s(out.ptr, path);
+
+	/* find file using new path */
+	cl_git_pass(git_sysdir_find_global_file(temp, file));
+
+	/* reset path and confirm file not found */
+	cl_git_pass(git_libgit2_opts(
+		GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, NULL));
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sysdir_find_global_file(temp, file));
+
+	git_str_dispose(&out);
+}
+
+void test_core_env__2(void)
+{
+	git_str path = GIT_STR_INIT, found = GIT_STR_INIT;
+	char testfile[16], tidx = '0';
+	char **val;
+	const char *testname = "alternate";
+	size_t testlen = strlen(testname);
+
+	strncpy(testfile, testname, sizeof(testfile));
+	cl_assert_equal_s(testname, testfile);
+
+	for (val = home_values; *val != NULL; val++) {
+
+		/* if we can't make the directory, let's just assume
+		 * we are on a filesystem that doesn't support the
+		 * characters in question and skip this test...
+		 */
+		if (p_mkdir(*val, 0777) != 0 && errno != EEXIST) {
+			*val = ""; /* mark as not created */
+			continue;
+		}
+
+		cl_git_pass(git_fs_path_prettify(&path, *val, NULL));
+
+		/* vary testfile name so any sloppiness is resetting variables or
+		 * deleting files won't accidentally make a test pass.
+		 */
+		testfile[testlen] = tidx++;
+		cl_git_pass(git_str_joinpath(&path, path.ptr, testfile));
+		cl_git_mkfile(path.ptr, "find me");
+		git_str_rtruncate_at_char(&path, '/');
+
+		/* default should be NOTFOUND */
+		cl_assert_equal_i(
+			GIT_ENOTFOUND, git_sysdir_find_global_file(&found, testfile));
+
+		/* try plain, append $PATH, and prepend $PATH */
+		check_global_searchpath(path.ptr,  0, testfile, &found);
+		check_global_searchpath(path.ptr, -1, testfile, &found);
+		check_global_searchpath(path.ptr,  1, testfile, &found);
+
+		/* cleanup */
+		cl_git_pass(git_str_joinpath(&path, path.ptr, testfile));
+		(void)p_unlink(path.ptr);
+		(void)p_rmdir(*val);
+	}
+
+	git_str_dispose(&path);
+	git_str_dispose(&found);
+}
+
+void test_core_env__substitution(void)
+{
+  git_str buf = GIT_STR_INIT, expected = GIT_STR_INIT;
+
+  /* Set it to something non-default so we have controllable values */
+  cl_git_pass(git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, "/tmp/a"));
+  cl_git_pass(git_libgit2_opts(GIT_OPT_GET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, &buf));
+  cl_assert_equal_s("/tmp/a", buf.ptr);
+
+  git_str_clear(&buf);
+  cl_git_pass(git_str_join(&buf, GIT_PATH_LIST_SEPARATOR, "$PATH", "/tmp/b"));
+  cl_git_pass(git_libgit2_opts(GIT_OPT_SET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, buf.ptr));
+  cl_git_pass(git_libgit2_opts(GIT_OPT_GET_SEARCH_PATH, GIT_CONFIG_LEVEL_GLOBAL, &buf));
+
+  cl_git_pass(git_str_join(&expected, GIT_PATH_LIST_SEPARATOR, "/tmp/a", "/tmp/b"));
+  cl_assert_equal_s(expected.ptr, buf.ptr);
+
+  git_str_dispose(&expected);
+  git_str_dispose(&buf);
+}
diff --git a/tests/libgit2/core/errors.c b/tests/libgit2/core/errors.c
new file mode 100644
index 000000000..386ecdc5f
--- /dev/null
+++ b/tests/libgit2/core/errors.c
@@ -0,0 +1,222 @@
+#include "clar_libgit2.h"
+
+void test_core_errors__public_api(void)
+{
+	char *str_in_error;
+
+	git_error_clear();
+	cl_assert(git_error_last() == NULL);
+
+	git_error_set_oom();
+
+	cl_assert(git_error_last() != NULL);
+	cl_assert(git_error_last()->klass == GIT_ERROR_NOMEMORY);
+	str_in_error = strstr(git_error_last()->message, "memory");
+	cl_assert(str_in_error != NULL);
+
+	git_error_clear();
+
+	git_error_set_str(GIT_ERROR_REPOSITORY, "This is a test");
+
+	cl_assert(git_error_last() != NULL);
+	str_in_error = strstr(git_error_last()->message, "This is a test");
+	cl_assert(str_in_error != NULL);
+
+	git_error_clear();
+	cl_assert(git_error_last() == NULL);
+}
+
+#include "common.h"
+#include "util.h"
+#include "posix.h"
+
+void test_core_errors__new_school(void)
+{
+	char *str_in_error;
+
+	git_error_clear();
+	cl_assert(git_error_last() == NULL);
+
+	git_error_set_oom(); /* internal fn */
+
+	cl_assert(git_error_last() != NULL);
+	cl_assert(git_error_last()->klass == GIT_ERROR_NOMEMORY);
+	str_in_error = strstr(git_error_last()->message, "memory");
+	cl_assert(str_in_error != NULL);
+
+	git_error_clear();
+
+	git_error_set(GIT_ERROR_REPOSITORY, "This is a test"); /* internal fn */
+
+	cl_assert(git_error_last() != NULL);
+	str_in_error = strstr(git_error_last()->message, "This is a test");
+	cl_assert(str_in_error != NULL);
+
+	git_error_clear();
+	cl_assert(git_error_last() == NULL);
+
+	do {
+		struct stat st;
+		memset(&st, 0, sizeof(st));
+		cl_assert(p_lstat("this_file_does_not_exist", &st) < 0);
+		GIT_UNUSED(st);
+	} while (false);
+	git_error_set(GIT_ERROR_OS, "stat failed"); /* internal fn */
+
+	cl_assert(git_error_last() != NULL);
+	str_in_error = strstr(git_error_last()->message, "stat failed");
+	cl_assert(str_in_error != NULL);
+	cl_assert(git__prefixcmp(str_in_error, "stat failed: ") == 0);
+	cl_assert(strlen(str_in_error) > strlen("stat failed: "));
+
+#ifdef GIT_WIN32
+	git_error_clear();
+
+	/* The MSDN docs use this to generate a sample error */
+	cl_assert(GetProcessId(NULL) == 0);
+	git_error_set(GIT_ERROR_OS, "GetProcessId failed"); /* internal fn */
+
+	cl_assert(git_error_last() != NULL);
+	str_in_error = strstr(git_error_last()->message, "GetProcessId failed");
+	cl_assert(str_in_error != NULL);
+	cl_assert(git__prefixcmp(str_in_error, "GetProcessId failed: ") == 0);
+	cl_assert(strlen(str_in_error) > strlen("GetProcessId failed: "));
+#endif
+
+	git_error_clear();
+}
+
+void test_core_errors__restore(void)
+{
+	git_error_state err_state = {0};
+
+	git_error_clear();
+	cl_assert(git_error_last() == NULL);
+
+	cl_assert_equal_i(0, git_error_state_capture(&err_state, 0));
+
+	memset(&err_state, 0x0, sizeof(git_error_state));
+
+	git_error_set(42, "Foo: %s", "bar");
+	cl_assert_equal_i(-1, git_error_state_capture(&err_state, -1));
+
+	cl_assert(git_error_last() == NULL);
+
+	git_error_set(99, "Bar: %s", "foo");
+
+	git_error_state_restore(&err_state);
+
+	cl_assert_equal_i(42, git_error_last()->klass);
+	cl_assert_equal_s("Foo: bar", git_error_last()->message);
+}
+
+void test_core_errors__free_state(void)
+{
+	git_error_state err_state = {0};
+
+	git_error_clear();
+
+	git_error_set(42, "Foo: %s", "bar");
+	cl_assert_equal_i(-1, git_error_state_capture(&err_state, -1));
+
+	git_error_set(99, "Bar: %s", "foo");
+
+	git_error_state_free(&err_state);
+
+	cl_assert_equal_i(99, git_error_last()->klass);
+	cl_assert_equal_s("Bar: foo", git_error_last()->message);
+
+	git_error_state_restore(&err_state);
+
+	cl_assert(git_error_last() == NULL);
+}
+
+void test_core_errors__restore_oom(void)
+{
+	git_error_state err_state = {0};
+	const git_error *oom_error = NULL;
+
+	git_error_clear();
+
+	git_error_set_oom(); /* internal fn */
+	oom_error = git_error_last();
+	cl_assert(oom_error);
+
+	cl_assert_equal_i(-1, git_error_state_capture(&err_state, -1));
+
+	cl_assert(git_error_last() == NULL);
+	cl_assert_equal_i(GIT_ERROR_NOMEMORY, err_state.error_msg.klass);
+	cl_assert_equal_s("Out of memory", err_state.error_msg.message);
+
+	git_error_state_restore(&err_state);
+
+	cl_assert(git_error_last()->klass == GIT_ERROR_NOMEMORY);
+	cl_assert_(git_error_last() == oom_error, "static oom error not restored");
+
+	git_error_clear();
+}
+
+static int test_arraysize_multiply(size_t nelem, size_t size)
+{
+	size_t out;
+	GIT_ERROR_CHECK_ALLOC_MULTIPLY(&out, nelem, size);
+	return 0;
+}
+
+void test_core_errors__integer_overflow_alloc_multiply(void)
+{
+	cl_git_pass(test_arraysize_multiply(10, 10));
+	cl_git_pass(test_arraysize_multiply(1000, 1000));
+	cl_git_pass(test_arraysize_multiply(SIZE_MAX/sizeof(void *), sizeof(void *)));
+	cl_git_pass(test_arraysize_multiply(0, 10));
+	cl_git_pass(test_arraysize_multiply(10, 0));
+
+	cl_git_fail(test_arraysize_multiply(SIZE_MAX-1, sizeof(void *)));
+	cl_git_fail(test_arraysize_multiply((SIZE_MAX/sizeof(void *))+1, sizeof(void *)));
+
+	cl_assert_equal_i(GIT_ERROR_NOMEMORY, git_error_last()->klass);
+	cl_assert_equal_s("Out of memory", git_error_last()->message);
+}
+
+static int test_arraysize_add(size_t one, size_t two)
+{
+	size_t out;
+	GIT_ERROR_CHECK_ALLOC_ADD(&out, one, two);
+	return 0;
+}
+
+void test_core_errors__integer_overflow_alloc_add(void)
+{
+	cl_git_pass(test_arraysize_add(10, 10));
+	cl_git_pass(test_arraysize_add(1000, 1000));
+	cl_git_pass(test_arraysize_add(SIZE_MAX-10, 10));
+
+	cl_git_fail(test_arraysize_multiply(SIZE_MAX-1, 2));
+	cl_git_fail(test_arraysize_multiply(SIZE_MAX, SIZE_MAX));
+
+	cl_assert_equal_i(GIT_ERROR_NOMEMORY, git_error_last()->klass);
+	cl_assert_equal_s("Out of memory", git_error_last()->message);
+}
+
+void test_core_errors__integer_overflow_sets_oom(void)
+{
+	size_t out;
+
+	git_error_clear();
+	cl_assert(!GIT_ADD_SIZET_OVERFLOW(&out, SIZE_MAX-1, 1));
+	cl_assert_equal_p(NULL, git_error_last());
+
+	git_error_clear();
+	cl_assert(!GIT_ADD_SIZET_OVERFLOW(&out, 42, 69));
+	cl_assert_equal_p(NULL, git_error_last());
+
+	git_error_clear();
+	cl_assert(GIT_ADD_SIZET_OVERFLOW(&out, SIZE_MAX, SIZE_MAX));
+	cl_assert_equal_i(GIT_ERROR_NOMEMORY, git_error_last()->klass);
+	cl_assert_equal_s("Out of memory", git_error_last()->message);
+
+	git_error_clear();
+	cl_assert(GIT_ADD_SIZET_OVERFLOW(&out, SIZE_MAX, SIZE_MAX));
+	cl_assert_equal_i(GIT_ERROR_NOMEMORY, git_error_last()->klass);
+	cl_assert_equal_s("Out of memory", git_error_last()->message);
+}
diff --git a/tests/libgit2/core/features.c b/tests/libgit2/core/features.c
new file mode 100644
index 000000000..7b28cc0cb
--- /dev/null
+++ b/tests/libgit2/core/features.c
@@ -0,0 +1,35 @@
+#include "clar_libgit2.h"
+
+void test_core_features__0(void)
+{
+	int major, minor, rev, caps;
+
+	git_libgit2_version(&major, &minor, &rev);
+	cl_assert_equal_i(LIBGIT2_VER_MAJOR, major);
+	cl_assert_equal_i(LIBGIT2_VER_MINOR, minor);
+	cl_assert_equal_i(LIBGIT2_VER_REVISION, rev);
+
+	caps = git_libgit2_features();
+
+#ifdef GIT_THREADS
+	cl_assert((caps & GIT_FEATURE_THREADS) != 0);
+#else
+	cl_assert((caps & GIT_FEATURE_THREADS) == 0);
+#endif
+
+#ifdef GIT_HTTPS
+	cl_assert((caps & GIT_FEATURE_HTTPS) != 0);
+#endif
+
+#if defined(GIT_SSH)
+	cl_assert((caps & GIT_FEATURE_SSH) != 0);
+#else
+	cl_assert((caps & GIT_FEATURE_SSH) == 0);
+#endif
+
+#if defined(GIT_USE_NSEC)
+	cl_assert((caps & GIT_FEATURE_NSEC) != 0);
+#else
+	cl_assert((caps & GIT_FEATURE_NSEC) == 0);
+#endif
+}
diff --git a/tests/libgit2/core/filebuf.c b/tests/libgit2/core/filebuf.c
new file mode 100644
index 000000000..6f40c2456
--- /dev/null
+++ b/tests/libgit2/core/filebuf.c
@@ -0,0 +1,267 @@
+#include "clar_libgit2.h"
+#include "filebuf.h"
+
+/* make sure git_filebuf_open doesn't delete an existing lock */
+void test_core_filebuf__0(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	int fd;
+	char test[] = "test", testlock[] = "test.lock";
+
+	fd = p_creat(testlock, 0744); /* -V536 */
+
+	cl_must_pass(fd);
+	cl_must_pass(p_close(fd));
+
+	cl_git_fail(git_filebuf_open(&file, test, 0, 0666));
+	cl_assert(git_fs_path_exists(testlock));
+
+	cl_must_pass(p_unlink(testlock));
+}
+
+
+/* make sure GIT_FILEBUF_APPEND works as expected */
+void test_core_filebuf__1(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char test[] = "test";
+
+	cl_git_mkfile(test, "libgit2 rocks\n");
+
+	cl_git_pass(git_filebuf_open(&file, test, GIT_FILEBUF_APPEND, 0666));
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+	cl_git_pass(git_filebuf_commit(&file));
+
+	cl_assert_equal_file("libgit2 rocks\nlibgit2 rocks\n", 0, test);
+
+	cl_must_pass(p_unlink(test));
+}
+
+
+/* make sure git_filebuf_write writes large buffer correctly */
+void test_core_filebuf__2(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char test[] = "test";
+	unsigned char buf[4096 * 4]; /* 2 * WRITE_BUFFER_SIZE */
+
+	memset(buf, 0xfe, sizeof(buf));
+
+	cl_git_pass(git_filebuf_open(&file, test, 0, 0666));
+	cl_git_pass(git_filebuf_write(&file, buf, sizeof(buf)));
+	cl_git_pass(git_filebuf_commit(&file));
+
+	cl_assert_equal_file((char *)buf, sizeof(buf), test);
+
+	cl_must_pass(p_unlink(test));
+}
+
+/* make sure git_filebuf_cleanup clears the buffer */
+void test_core_filebuf__4(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char test[] = "test";
+
+	cl_assert(file.buffer == NULL);
+
+	cl_git_pass(git_filebuf_open(&file, test, 0, 0666));
+	cl_assert(file.buffer != NULL);
+
+	git_filebuf_cleanup(&file);
+	cl_assert(file.buffer == NULL);
+}
+
+
+/* make sure git_filebuf_commit clears the buffer */
+void test_core_filebuf__5(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char test[] = "test";
+
+	cl_assert(file.buffer == NULL);
+
+	cl_git_pass(git_filebuf_open(&file, test, 0, 0666));
+	cl_assert(file.buffer != NULL);
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+	cl_assert(file.buffer != NULL);
+
+	cl_git_pass(git_filebuf_commit(&file));
+	cl_assert(file.buffer == NULL);
+
+	cl_must_pass(p_unlink(test));
+}
+
+
+/* make sure git_filebuf_commit takes umask into account */
+void test_core_filebuf__umask(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char test[] = "test";
+	struct stat statbuf;
+	mode_t mask, os_mask;
+
+#ifdef GIT_WIN32
+	os_mask = 0600;
+#else
+	os_mask = 0777;
+#endif
+
+	p_umask(mask = p_umask(0));
+
+	cl_assert(file.buffer == NULL);
+
+	cl_git_pass(git_filebuf_open(&file, test, 0, 0666));
+	cl_assert(file.buffer != NULL);
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+	cl_assert(file.buffer != NULL);
+
+	cl_git_pass(git_filebuf_commit(&file));
+	cl_assert(file.buffer == NULL);
+
+	cl_must_pass(p_stat("test", &statbuf));
+	cl_assert_equal_i(statbuf.st_mode & os_mask, (0666 & ~mask) & os_mask);
+
+	cl_must_pass(p_unlink(test));
+}
+
+void test_core_filebuf__rename_error(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char *dir = "subdir",  *test = "subdir/test", *test_lock = "subdir/test.lock";
+	int fd;
+
+#ifndef GIT_WIN32
+	cl_skip();
+#endif
+
+	cl_git_pass(p_mkdir(dir, 0666));
+	cl_git_mkfile(test, "dummy content");
+	fd = p_open(test, O_RDONLY);
+	cl_assert(fd > 0);
+	cl_git_pass(git_filebuf_open(&file, test, 0, 0666));
+
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+
+	cl_assert_equal_i(true, git_fs_path_exists(test_lock));
+
+	cl_git_fail(git_filebuf_commit(&file));
+	p_close(fd);
+
+	git_filebuf_cleanup(&file);
+
+	cl_assert_equal_i(false, git_fs_path_exists(test_lock));
+}
+
+void test_core_filebuf__symlink_follow(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	const char *dir = "linkdir", *source = "linkdir/link";
+
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		cl_skip();
+
+	cl_git_pass(p_mkdir(dir, 0777));
+	cl_git_pass(p_symlink("target", source));
+
+	cl_git_pass(git_filebuf_open(&file, source, 0, 0666));
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+
+	cl_assert_equal_i(true, git_fs_path_exists("linkdir/target.lock"));
+
+	cl_git_pass(git_filebuf_commit(&file));
+	cl_assert_equal_i(true, git_fs_path_exists("linkdir/target"));
+
+	git_filebuf_cleanup(&file);
+
+	/* The second time around, the target file does exist */
+	cl_git_pass(git_filebuf_open(&file, source, 0, 0666));
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+
+	cl_assert_equal_i(true, git_fs_path_exists("linkdir/target.lock"));
+
+	cl_git_pass(git_filebuf_commit(&file));
+	cl_assert_equal_i(true, git_fs_path_exists("linkdir/target"));
+
+	git_filebuf_cleanup(&file);
+	cl_git_pass(git_futils_rmdir_r(dir, NULL, GIT_RMDIR_REMOVE_FILES));
+}
+
+void test_core_filebuf__symlink_follow_absolute_paths(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	git_str source = GIT_STR_INIT, target = GIT_STR_INIT;
+
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		cl_skip();
+
+	cl_git_pass(git_str_joinpath(&source, clar_sandbox_path(), "linkdir/link"));
+	cl_git_pass(git_str_joinpath(&target, clar_sandbox_path(), "linkdir/target"));
+	cl_git_pass(p_mkdir("linkdir", 0777));
+	cl_git_pass(p_symlink(target.ptr, source.ptr));
+
+	cl_git_pass(git_filebuf_open(&file, source.ptr, 0, 0666));
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+
+	cl_assert_equal_i(true, git_fs_path_exists("linkdir/target.lock"));
+
+	cl_git_pass(git_filebuf_commit(&file));
+	cl_assert_equal_i(true, git_fs_path_exists("linkdir/target"));
+
+	git_filebuf_cleanup(&file);
+	git_str_dispose(&source);
+	git_str_dispose(&target);
+
+	cl_git_pass(git_futils_rmdir_r("linkdir", NULL, GIT_RMDIR_REMOVE_FILES));
+}
+
+void test_core_filebuf__symlink_depth(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+	const char *dir = "linkdir", *source = "linkdir/link";
+
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		cl_skip();
+
+	cl_git_pass(p_mkdir(dir, 0777));
+	/* Endless loop */
+	cl_git_pass(p_symlink("link", source));
+
+	cl_git_fail(git_filebuf_open(&file, source, 0, 0666));
+
+	cl_git_pass(git_futils_rmdir_r(dir, NULL, GIT_RMDIR_REMOVE_FILES));
+}
+
+void test_core_filebuf__hidden_file(void)
+{
+#ifndef GIT_WIN32
+	cl_skip();
+#else
+	git_filebuf file = GIT_FILEBUF_INIT;
+	char *dir = "hidden", *test = "hidden/test";
+	bool hidden;
+
+	cl_git_pass(p_mkdir(dir, 0666));
+	cl_git_mkfile(test, "dummy content");
+
+	cl_git_pass(git_win32__set_hidden(test, true));
+	cl_git_pass(git_win32__hidden(&hidden, test));
+	cl_assert(hidden);
+
+	cl_git_pass(git_filebuf_open(&file, test, 0, 0666));
+
+	cl_git_pass(git_filebuf_printf(&file, "%s\n", "libgit2 rocks"));
+
+	cl_git_pass(git_filebuf_commit(&file));
+
+	git_filebuf_cleanup(&file);
+#endif
+}
+
+void test_core_filebuf__detects_directory(void)
+{
+	git_filebuf file = GIT_FILEBUF_INIT;
+
+	cl_must_pass(p_mkdir("foo", 0777));
+	cl_git_fail_with(GIT_EDIRECTORY, git_filebuf_open(&file, "foo", 0, 0666));
+	cl_must_pass(p_rmdir("foo"));
+}
diff --git a/tests/libgit2/core/ftruncate.c b/tests/libgit2/core/ftruncate.c
new file mode 100644
index 000000000..0c731cb1e
--- /dev/null
+++ b/tests/libgit2/core/ftruncate.c
@@ -0,0 +1,48 @@
+/**
+ * Some tests for p_ftruncate() to ensure that
+ * properly handles large (2Gb+) files.
+ */
+
+#include "clar_libgit2.h"
+
+static const char *filename = "core_ftruncate.txt";
+static int fd = -1;
+
+void test_core_ftruncate__initialize(void)
+{
+	if (!cl_is_env_set("GITTEST_INVASIVE_FS_SIZE"))
+		cl_skip();
+
+	cl_must_pass((fd = p_open(filename, O_CREAT | O_RDWR, 0644)));
+}
+
+void test_core_ftruncate__cleanup(void)
+{
+	if (fd < 0)
+		return;
+
+	p_close(fd);
+	fd = 0;
+
+	p_unlink(filename);
+}
+
+static void _extend(off64_t i64len)
+{
+	struct stat st;
+	int error;
+
+	cl_assert((error = p_ftruncate(fd, i64len)) == 0);
+	cl_assert((error = p_fstat(fd, &st)) == 0);
+	cl_assert(st.st_size == i64len);
+}
+
+void test_core_ftruncate__2gb(void)
+{
+	_extend(0x80000001);
+}
+
+void test_core_ftruncate__4gb(void)
+{
+	_extend(0x100000001);
+}
diff --git a/tests/libgit2/core/futils.c b/tests/libgit2/core/futils.c
new file mode 100644
index 000000000..3501765f6
--- /dev/null
+++ b/tests/libgit2/core/futils.c
@@ -0,0 +1,115 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+
+/* Fixture setup and teardown */
+void test_core_futils__initialize(void)
+{
+	cl_must_pass(p_mkdir("futils", 0777));
+}
+
+void test_core_futils__cleanup(void)
+{
+	cl_fixture_cleanup("futils");
+}
+
+void test_core_futils__writebuffer(void)
+{
+	git_str out = GIT_STR_INIT,
+		append = GIT_STR_INIT;
+
+	/* create a new file */
+	git_str_puts(&out, "hello!\n");
+	git_str_printf(&out, "this is a %s\n", "test");
+
+	cl_git_pass(git_futils_writebuffer(&out, "futils/test-file", O_RDWR|O_CREAT, 0666));
+
+	cl_assert_equal_file(out.ptr, out.size, "futils/test-file");
+
+	/* append some more data */
+	git_str_puts(&append, "And some more!\n");
+	git_str_put(&out, append.ptr, append.size);
+
+	cl_git_pass(git_futils_writebuffer(&append, "futils/test-file", O_RDWR|O_APPEND, 0666));
+
+	cl_assert_equal_file(out.ptr, out.size, "futils/test-file");
+
+	git_str_dispose(&out);
+	git_str_dispose(&append);
+}
+
+void test_core_futils__write_hidden_file(void)
+{
+#ifndef GIT_WIN32
+	cl_skip();
+#else
+	git_str out = GIT_STR_INIT, append = GIT_STR_INIT;
+	bool hidden;
+
+	git_str_puts(&out, "hidden file.\n");
+	git_futils_writebuffer(&out, "futils/test-file", O_RDWR | O_CREAT, 0666);
+
+	cl_git_pass(git_win32__set_hidden("futils/test-file", true));
+
+	/* append some more data */
+	git_str_puts(&append, "And some more!\n");
+	git_str_put(&out, append.ptr, append.size);
+
+	cl_git_pass(git_futils_writebuffer(&append, "futils/test-file", O_RDWR | O_APPEND, 0666));
+
+	cl_assert_equal_file(out.ptr, out.size, "futils/test-file");
+
+	cl_git_pass(git_win32__hidden(&hidden, "futils/test-file"));
+	cl_assert(hidden);
+
+	git_str_dispose(&out);
+	git_str_dispose(&append);
+#endif
+}
+
+void test_core_futils__recursive_rmdir_keeps_symlink_targets(void)
+{
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		cl_skip();
+
+	cl_git_pass(git_futils_mkdir_r("a/b", 0777));
+	cl_git_pass(git_futils_mkdir_r("dir-target", 0777));
+	cl_git_mkfile("dir-target/file", "Contents");
+	cl_git_mkfile("file-target", "Contents");
+	cl_must_pass(p_symlink("dir-target", "a/symlink"));
+	cl_must_pass(p_symlink("file-target", "a/b/symlink"));
+
+	cl_git_pass(git_futils_rmdir_r("a", NULL, GIT_RMDIR_REMOVE_FILES));
+
+	cl_assert(git_fs_path_exists("dir-target"));
+	cl_assert(git_fs_path_exists("file-target"));
+
+	cl_must_pass(p_unlink("dir-target/file"));
+	cl_must_pass(p_rmdir("dir-target"));
+	cl_must_pass(p_unlink("file-target"));
+}
+
+void test_core_futils__mktmp_umask(void)
+{
+#ifdef GIT_WIN32
+	cl_skip();
+#else
+	git_str path = GIT_STR_INIT;
+	struct stat st;
+	int fd;
+
+	umask(0);
+	cl_assert((fd = git_futils_mktmp(&path, "foo", 0777)) >= 0);
+	cl_must_pass(p_fstat(fd, &st));
+	cl_assert_equal_i(st.st_mode & 0777, 0777);
+	cl_must_pass(p_unlink(path.ptr));
+	close(fd);
+
+	umask(077);
+	cl_assert((fd = git_futils_mktmp(&path, "foo", 0777)) >= 0);
+	cl_must_pass(p_fstat(fd, &st));
+	cl_assert_equal_i(st.st_mode & 0777, 0700);
+	cl_must_pass(p_unlink(path.ptr));
+	close(fd);
+	git_str_dispose(&path);
+#endif
+}
diff --git a/tests/libgit2/core/gitstr.c b/tests/libgit2/core/gitstr.c
new file mode 100644
index 000000000..0a624e28c
--- /dev/null
+++ b/tests/libgit2/core/gitstr.c
@@ -0,0 +1,1225 @@
+#include "clar_libgit2.h"
+#include "git2/sys/hashsig.h"
+#include "futils.h"
+
+#define TESTSTR "Have you seen that? Have you seeeen that??"
+const char *test_string = TESTSTR;
+const char *test_string_x2 = TESTSTR TESTSTR;
+
+#define TESTSTR_4096 REP1024("1234")
+#define TESTSTR_8192 REP1024("12341234")
+const char *test_4096 = TESTSTR_4096;
+const char *test_8192 = TESTSTR_8192;
+
+/* test basic data concatenation */
+void test_core_gitstr__0(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	cl_assert(buf.size == 0);
+
+	git_str_puts(&buf, test_string);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_string, git_str_cstr(&buf));
+
+	git_str_puts(&buf, test_string);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_string_x2, git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+/* test git_str_printf */
+void test_core_gitstr__1(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	git_str_printf(&buf, "%s %s %d ", "shoop", "da", 23);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s("shoop da 23 ", git_str_cstr(&buf));
+
+	git_str_printf(&buf, "%s %d", "woop", 42);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s("shoop da 23 woop 42", git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+/* more thorough test of concatenation options */
+void test_core_gitstr__2(void)
+{
+	git_str buf = GIT_STR_INIT;
+	int i;
+	char data[128];
+
+	cl_assert(buf.size == 0);
+
+	/* this must be safe to do */
+	git_str_dispose(&buf);
+	cl_assert(buf.size == 0);
+	cl_assert(buf.asize == 0);
+
+	/* empty buffer should be empty string */
+	cl_assert_equal_s("", git_str_cstr(&buf));
+	cl_assert(buf.size == 0);
+	/* cl_assert(buf.asize == 0); -- should not assume what git_str does */
+
+	/* free should set us back to the beginning */
+	git_str_dispose(&buf);
+	cl_assert(buf.size == 0);
+	cl_assert(buf.asize == 0);
+
+	/* add letter */
+	git_str_putc(&buf, '+');
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s("+", git_str_cstr(&buf));
+
+	/* add letter again */
+	git_str_putc(&buf, '+');
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s("++", git_str_cstr(&buf));
+
+	/* let's try that a few times */
+	for (i = 0; i < 16; ++i) {
+		git_str_putc(&buf, '+');
+		cl_assert(git_str_oom(&buf) == 0);
+	}
+	cl_assert_equal_s("++++++++++++++++++", git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+
+	/* add data */
+	git_str_put(&buf, "xo", 2);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s("xo", git_str_cstr(&buf));
+
+	/* add letter again */
+	git_str_put(&buf, "xo", 2);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s("xoxo", git_str_cstr(&buf));
+
+	/* let's try that a few times */
+	for (i = 0; i < 16; ++i) {
+		git_str_put(&buf, "xo", 2);
+		cl_assert(git_str_oom(&buf) == 0);
+	}
+	cl_assert_equal_s("xoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxo",
+					   git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+
+	/* set to string */
+	git_str_sets(&buf, test_string);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_string, git_str_cstr(&buf));
+
+	/* append string */
+	git_str_puts(&buf, test_string);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_string_x2, git_str_cstr(&buf));
+
+	/* set to string again (should overwrite - not append) */
+	git_str_sets(&buf, test_string);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_string, git_str_cstr(&buf));
+
+	/* test clear */
+	git_str_clear(&buf);
+	cl_assert_equal_s("", git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+
+	/* test extracting data into buffer */
+	git_str_puts(&buf, REP4("0123456789"));
+	cl_assert(git_str_oom(&buf) == 0);
+
+	git_str_copy_cstr(data, sizeof(data), &buf);
+	cl_assert_equal_s(REP4("0123456789"), data);
+	git_str_copy_cstr(data, 11, &buf);
+	cl_assert_equal_s("0123456789", data);
+	git_str_copy_cstr(data, 3, &buf);
+	cl_assert_equal_s("01", data);
+	git_str_copy_cstr(data, 1, &buf);
+	cl_assert_equal_s("", data);
+
+	git_str_copy_cstr(data, sizeof(data), &buf);
+	cl_assert_equal_s(REP4("0123456789"), data);
+
+	git_str_sets(&buf, REP256("x"));
+	git_str_copy_cstr(data, sizeof(data), &buf);
+	/* since sizeof(data) == 128, only 127 bytes should be copied */
+	cl_assert_equal_s(REP4(REP16("x")) REP16("x") REP16("x")
+					   REP16("x") "xxxxxxxxxxxxxxx", data);
+
+	git_str_dispose(&buf);
+
+	git_str_copy_cstr(data, sizeof(data), &buf);
+	cl_assert_equal_s("", data);
+}
+
+/* let's do some tests with larger buffers to push our limits */
+void test_core_gitstr__3(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	/* set to string */
+	git_str_set(&buf, test_4096, 4096);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_4096, git_str_cstr(&buf));
+
+	/* append string */
+	git_str_puts(&buf, test_4096);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_8192, git_str_cstr(&buf));
+
+	/* set to string again (should overwrite - not append) */
+	git_str_set(&buf, test_4096, 4096);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(test_4096, git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+/* let's try some producer/consumer tests */
+void test_core_gitstr__4(void)
+{
+	git_str buf = GIT_STR_INIT;
+	int i;
+
+	for (i = 0; i < 10; ++i) {
+		git_str_puts(&buf, "1234"); /* add 4 */
+		cl_assert(git_str_oom(&buf) == 0);
+		git_str_consume(&buf, buf.ptr + 2); /* eat the first two */
+		cl_assert(strlen(git_str_cstr(&buf)) == (size_t)((i + 1) * 2));
+	}
+	/* we have appended 1234 10x and removed the first 20 letters */
+	cl_assert_equal_s("12341234123412341234", git_str_cstr(&buf));
+
+	git_str_consume(&buf, NULL);
+	cl_assert_equal_s("12341234123412341234", git_str_cstr(&buf));
+
+	git_str_consume(&buf, "invalid pointer");
+	cl_assert_equal_s("12341234123412341234", git_str_cstr(&buf));
+
+	git_str_consume(&buf, buf.ptr);
+	cl_assert_equal_s("12341234123412341234", git_str_cstr(&buf));
+
+	git_str_consume(&buf, buf.ptr + 1);
+	cl_assert_equal_s("2341234123412341234", git_str_cstr(&buf));
+
+	git_str_consume(&buf, buf.ptr + buf.size);
+	cl_assert_equal_s("", git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+
+static void
+check_buf_append(
+	const char* data_a,
+	const char* data_b,
+	const char* expected_data,
+	size_t expected_size,
+	size_t expected_asize)
+{
+	git_str tgt = GIT_STR_INIT;
+
+	git_str_sets(&tgt, data_a);
+	cl_assert(git_str_oom(&tgt) == 0);
+	git_str_puts(&tgt, data_b);
+	cl_assert(git_str_oom(&tgt) == 0);
+	cl_assert_equal_s(expected_data, git_str_cstr(&tgt));
+	cl_assert_equal_i(tgt.size, expected_size);
+	if (expected_asize > 0)
+		cl_assert_equal_i(tgt.asize, expected_asize);
+
+	git_str_dispose(&tgt);
+}
+
+static void
+check_buf_append_abc(
+	const char* buf_a,
+	const char* buf_b,
+	const char* buf_c,
+	const char* expected_ab,
+	const char* expected_abc,
+	const char* expected_abca,
+	const char* expected_abcab,
+	const char* expected_abcabc)
+{
+	git_str buf = GIT_STR_INIT;
+
+	git_str_sets(&buf, buf_a);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(buf_a, git_str_cstr(&buf));
+
+	git_str_puts(&buf, buf_b);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected_ab, git_str_cstr(&buf));
+
+	git_str_puts(&buf, buf_c);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected_abc, git_str_cstr(&buf));
+
+	git_str_puts(&buf, buf_a);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected_abca, git_str_cstr(&buf));
+
+	git_str_puts(&buf, buf_b);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected_abcab, git_str_cstr(&buf));
+
+	git_str_puts(&buf, buf_c);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected_abcabc, git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+/* more variations on append tests */
+void test_core_gitstr__5(void)
+{
+	check_buf_append("", "", "", 0, 0);
+	check_buf_append("a", "", "a", 1, 0);
+	check_buf_append("", "a", "a", 1, 8);
+	check_buf_append("", "a", "a", 1, 8);
+	check_buf_append("a", "b", "ab", 2, 8);
+	check_buf_append("", "abcdefgh", "abcdefgh", 8, 16);
+	check_buf_append("abcdefgh", "", "abcdefgh", 8, 16);
+
+	/* buffer with starting asize will grow to:
+	 *  1 ->  2,  2 ->  3,  3 ->  5,  4 ->  6,  5 ->  8,  6 ->  9,
+	 *  7 -> 11,  8 -> 12,  9 -> 14, 10 -> 15, 11 -> 17, 12 -> 18,
+	 * 13 -> 20, 14 -> 21, 15 -> 23, 16 -> 24, 17 -> 26, 18 -> 27,
+	 * 19 -> 29, 20 -> 30, 21 -> 32, 22 -> 33, 23 -> 35, 24 -> 36,
+	 * ...
+	 * follow sequence until value > target size,
+	 * then round up to nearest multiple of 8.
+	 */
+
+	check_buf_append("abcdefgh", "/", "abcdefgh/", 9, 16);
+	check_buf_append("abcdefgh", "ijklmno", "abcdefghijklmno", 15, 16);
+	check_buf_append("abcdefgh", "ijklmnop", "abcdefghijklmnop", 16, 24);
+	check_buf_append("0123456789", "0123456789",
+					 "01234567890123456789", 20, 24);
+	check_buf_append(REP16("x"), REP16("o"),
+					 REP16("x") REP16("o"), 32, 40);
+
+	check_buf_append(test_4096, "", test_4096, 4096, 4104);
+	check_buf_append(test_4096, test_4096, test_8192, 8192, 8200);
+
+	/* check sequences of appends */
+	check_buf_append_abc("a", "b", "c",
+						 "ab", "abc", "abca", "abcab", "abcabc");
+	check_buf_append_abc("a1", "b2", "c3",
+						 "a1b2", "a1b2c3", "a1b2c3a1",
+						 "a1b2c3a1b2", "a1b2c3a1b2c3");
+	check_buf_append_abc("a1/", "b2/", "c3/",
+						 "a1/b2/", "a1/b2/c3/", "a1/b2/c3/a1/",
+						 "a1/b2/c3/a1/b2/", "a1/b2/c3/a1/b2/c3/");
+}
+
+/* test swap */
+void test_core_gitstr__6(void)
+{
+	git_str a = GIT_STR_INIT;
+	git_str b = GIT_STR_INIT;
+
+	git_str_sets(&a, "foo");
+	cl_assert(git_str_oom(&a) == 0);
+	git_str_sets(&b, "bar");
+	cl_assert(git_str_oom(&b) == 0);
+
+	cl_assert_equal_s("foo", git_str_cstr(&a));
+	cl_assert_equal_s("bar", git_str_cstr(&b));
+
+	git_str_swap(&a, &b);
+
+	cl_assert_equal_s("bar", git_str_cstr(&a));
+	cl_assert_equal_s("foo", git_str_cstr(&b));
+
+	git_str_dispose(&a);
+	git_str_dispose(&b);
+}
+
+
+/* test detach/attach data */
+void test_core_gitstr__7(void)
+{
+	const char *fun = "This is fun";
+	git_str a = GIT_STR_INIT;
+	char *b = NULL;
+
+	git_str_sets(&a, "foo");
+	cl_assert(git_str_oom(&a) == 0);
+	cl_assert_equal_s("foo", git_str_cstr(&a));
+
+	b = git_str_detach(&a);
+
+	cl_assert_equal_s("foo", b);
+	cl_assert_equal_s("", a.ptr);
+	git__free(b);
+
+	b = git_str_detach(&a);
+
+	cl_assert_equal_s(NULL, b);
+	cl_assert_equal_s("", a.ptr);
+
+	git_str_dispose(&a);
+
+	b = git__strdup(fun);
+	git_str_attach(&a, b, 0);
+
+	cl_assert_equal_s(fun, a.ptr);
+	cl_assert(a.size == strlen(fun));
+	cl_assert(a.asize == strlen(fun) + 1);
+
+	git_str_dispose(&a);
+
+	b = git__strdup(fun);
+	git_str_attach(&a, b, strlen(fun) + 1);
+
+	cl_assert_equal_s(fun, a.ptr);
+	cl_assert(a.size == strlen(fun));
+	cl_assert(a.asize == strlen(fun) + 1);
+
+	git_str_dispose(&a);
+}
+
+
+static void
+check_joinbuf_2(
+	const char *a,
+	const char *b,
+	const char *expected)
+{
+	char sep = '/';
+	git_str buf = GIT_STR_INIT;
+
+	git_str_join(&buf, sep, a, b);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected, git_str_cstr(&buf));
+	git_str_dispose(&buf);
+}
+
+static void
+check_joinbuf_overlapped(
+	const char *oldval,
+	int ofs_a,
+	const char *b,
+	const char *expected)
+{
+	char sep = '/';
+	git_str buf = GIT_STR_INIT;
+
+	git_str_sets(&buf, oldval);
+	git_str_join(&buf, sep, buf.ptr + ofs_a, b);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected, git_str_cstr(&buf));
+	git_str_dispose(&buf);
+}
+
+static void
+check_joinbuf_n_2(
+	const char *a,
+	const char *b,
+	const char *expected)
+{
+	char sep = '/';
+	git_str buf = GIT_STR_INIT;
+
+	git_str_sets(&buf, a);
+	cl_assert(git_str_oom(&buf) == 0);
+
+	git_str_join_n(&buf, sep, 1, b);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected, git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+static void
+check_joinbuf_n_4(
+	const char *a,
+	const char *b,
+	const char *c,
+	const char *d,
+	const char *expected)
+{
+	char sep = ';';
+	git_str buf = GIT_STR_INIT;
+	git_str_join_n(&buf, sep, 4, a, b, c, d);
+	cl_assert(git_str_oom(&buf) == 0);
+	cl_assert_equal_s(expected, git_str_cstr(&buf));
+	git_str_dispose(&buf);
+}
+
+/* test join */
+void test_core_gitstr__8(void)
+{
+	git_str a = GIT_STR_INIT;
+
+	git_str_join_n(&a, '/', 1, "foo");
+	cl_assert(git_str_oom(&a) == 0);
+	cl_assert_equal_s("foo", git_str_cstr(&a));
+
+	git_str_join_n(&a, '/', 1, "bar");
+	cl_assert(git_str_oom(&a) == 0);
+	cl_assert_equal_s("foo/bar", git_str_cstr(&a));
+
+	git_str_join_n(&a, '/', 1, "baz");
+	cl_assert(git_str_oom(&a) == 0);
+	cl_assert_equal_s("foo/bar/baz", git_str_cstr(&a));
+
+	git_str_dispose(&a);
+
+	check_joinbuf_2(NULL, "", "");
+	check_joinbuf_2(NULL, "a", "a");
+	check_joinbuf_2(NULL, "/a", "/a");
+	check_joinbuf_2("", "", "");
+	check_joinbuf_2("", "a", "a");
+	check_joinbuf_2("", "/a", "/a");
+	check_joinbuf_2("a", "", "a/");
+	check_joinbuf_2("a", "/", "a/");
+	check_joinbuf_2("a", "b", "a/b");
+	check_joinbuf_2("/", "a", "/a");
+	check_joinbuf_2("/", "", "/");
+	check_joinbuf_2("/a", "/b", "/a/b");
+	check_joinbuf_2("/a", "/b/", "/a/b/");
+	check_joinbuf_2("/a/", "b/", "/a/b/");
+	check_joinbuf_2("/a/", "/b/", "/a/b/");
+	check_joinbuf_2("/a/", "//b/", "/a/b/");
+	check_joinbuf_2("/abcd", "/defg", "/abcd/defg");
+	check_joinbuf_2("/abcd", "/defg/", "/abcd/defg/");
+	check_joinbuf_2("/abcd/", "defg/", "/abcd/defg/");
+	check_joinbuf_2("/abcd/", "/defg/", "/abcd/defg/");
+
+	check_joinbuf_overlapped("abcd", 0, "efg", "abcd/efg");
+	check_joinbuf_overlapped("abcd", 1, "efg", "bcd/efg");
+	check_joinbuf_overlapped("abcd", 2, "efg", "cd/efg");
+	check_joinbuf_overlapped("abcd", 3, "efg", "d/efg");
+	check_joinbuf_overlapped("abcd", 4, "efg", "efg");
+	check_joinbuf_overlapped("abc/", 2, "efg", "c/efg");
+	check_joinbuf_overlapped("abc/", 3, "efg", "/efg");
+	check_joinbuf_overlapped("abc/", 4, "efg", "efg");
+	check_joinbuf_overlapped("abcd", 3, "", "d/");
+	check_joinbuf_overlapped("abcd", 4, "", "");
+	check_joinbuf_overlapped("abc/", 2, "", "c/");
+	check_joinbuf_overlapped("abc/", 3, "", "/");
+	check_joinbuf_overlapped("abc/", 4, "", "");
+
+	check_joinbuf_n_2("", "", "");
+	check_joinbuf_n_2("", "a", "a");
+	check_joinbuf_n_2("", "/a", "/a");
+	check_joinbuf_n_2("a", "", "a/");
+	check_joinbuf_n_2("a", "/", "a/");
+	check_joinbuf_n_2("a", "b", "a/b");
+	check_joinbuf_n_2("/", "a", "/a");
+	check_joinbuf_n_2("/", "", "/");
+	check_joinbuf_n_2("/a", "/b", "/a/b");
+	check_joinbuf_n_2("/a", "/b/", "/a/b/");
+	check_joinbuf_n_2("/a/", "b/", "/a/b/");
+	check_joinbuf_n_2("/a/", "/b/", "/a/b/");
+	check_joinbuf_n_2("/abcd", "/defg", "/abcd/defg");
+	check_joinbuf_n_2("/abcd", "/defg/", "/abcd/defg/");
+	check_joinbuf_n_2("/abcd/", "defg/", "/abcd/defg/");
+	check_joinbuf_n_2("/abcd/", "/defg/", "/abcd/defg/");
+
+	check_joinbuf_n_4("", "", "", "", "");
+	check_joinbuf_n_4("", "a", "", "", "a;");
+	check_joinbuf_n_4("a", "", "", "", "a;");
+	check_joinbuf_n_4("", "", "", "a", "a");
+	check_joinbuf_n_4("a", "b", "", ";c;d;", "a;b;c;d;");
+	check_joinbuf_n_4("a", "b", "", ";c;d", "a;b;c;d");
+	check_joinbuf_n_4("abcd", "efgh", "ijkl", "mnop", "abcd;efgh;ijkl;mnop");
+	check_joinbuf_n_4("abcd;", "efgh;", "ijkl;", "mnop;", "abcd;efgh;ijkl;mnop;");
+	check_joinbuf_n_4(";abcd;", ";efgh;", ";ijkl;", ";mnop;", ";abcd;efgh;ijkl;mnop;");
+}
+
+void test_core_gitstr__9(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	/* just some exhaustive tests of various separator placement */
+	char *a[] = { "", "-", "a-", "-a", "-a-" };
+	char *b[] = { "", "-", "b-", "-b", "-b-" };
+	char sep[] = { 0, '-', '/' };
+	char *expect_null[] = { "",    "-",     "a-",     "-a",     "-a-",
+							"-",   "--",    "a--",    "-a-",    "-a--",
+							"b-",  "-b-",   "a-b-",   "-ab-",   "-a-b-",
+							"-b",  "--b",   "a--b",   "-a-b",   "-a--b",
+							"-b-", "--b-",  "a--b-",  "-a-b-",  "-a--b-" };
+	char *expect_dash[] = { "",    "-",     "a-",     "-a-",    "-a-",
+							"-",   "-",     "a-",     "-a-",    "-a-",
+							"b-",  "-b-",   "a-b-",   "-a-b-",  "-a-b-",
+							"-b",  "-b",    "a-b",    "-a-b",   "-a-b",
+							"-b-", "-b-",   "a-b-",   "-a-b-",  "-a-b-" };
+	char *expect_slas[] = { "",    "-/",    "a-/",    "-a/",    "-a-/",
+							"-",   "-/-",   "a-/-",   "-a/-",   "-a-/-",
+							"b-",  "-/b-",  "a-/b-",  "-a/b-",  "-a-/b-",
+							"-b",  "-/-b",  "a-/-b",  "-a/-b",  "-a-/-b",
+							"-b-", "-/-b-", "a-/-b-", "-a/-b-", "-a-/-b-" };
+	char **expect_values[] = { expect_null, expect_dash, expect_slas };
+	char separator, **expect;
+	unsigned int s, i, j;
+
+	for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {
+		separator = sep[s];
+		expect = expect_values[s];
+
+		for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {
+			for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {
+				git_str_join(&buf, separator, a[i], b[j]);
+				cl_assert_equal_s(*expect, buf.ptr);
+				expect++;
+			}
+		}
+	}
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__10(void)
+{
+	git_str a = GIT_STR_INIT;
+
+	cl_git_pass(git_str_join_n(&a, '/', 1, "test"));
+	cl_assert_equal_s(a.ptr, "test");
+	cl_git_pass(git_str_join_n(&a, '/', 1, "string"));
+	cl_assert_equal_s(a.ptr, "test/string");
+	git_str_clear(&a);
+	cl_git_pass(git_str_join_n(&a, '/', 3, "test", "string", "join"));
+	cl_assert_equal_s(a.ptr, "test/string/join");
+	cl_git_pass(git_str_join_n(&a, '/', 2, a.ptr, "more"));
+	cl_assert_equal_s(a.ptr, "test/string/join/test/string/join/more");
+
+	git_str_dispose(&a);
+}
+
+void test_core_gitstr__join3(void)
+{
+	git_str a = GIT_STR_INIT;
+
+	cl_git_pass(git_str_join3(&a, '/', "test", "string", "join"));
+	cl_assert_equal_s("test/string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "test/", "string", "join"));
+	cl_assert_equal_s("test/string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "test/", "/string", "join"));
+	cl_assert_equal_s("test/string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "test/", "/string/", "join"));
+	cl_assert_equal_s("test/string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "test/", "/string/", "/join"));
+	cl_assert_equal_s("test/string/join", a.ptr);
+
+	cl_git_pass(git_str_join3(&a, '/', "", "string", "join"));
+	cl_assert_equal_s("string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "", "string/", "join"));
+	cl_assert_equal_s("string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "", "string/", "/join"));
+	cl_assert_equal_s("string/join", a.ptr);
+
+	cl_git_pass(git_str_join3(&a, '/', "string", "", "join"));
+	cl_assert_equal_s("string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "string/", "", "join"));
+	cl_assert_equal_s("string/join", a.ptr);
+	cl_git_pass(git_str_join3(&a, '/', "string/", "", "/join"));
+	cl_assert_equal_s("string/join", a.ptr);
+
+	git_str_dispose(&a);
+}
+
+void test_core_gitstr__11(void)
+{
+	git_str a = GIT_STR_INIT;
+	char *t1[] = { "nothing", "in", "common" };
+	char *t2[] = { "something", "something else", "some other" };
+	char *t3[] = { "something", "some fun", "no fun" };
+	char *t4[] = { "happy", "happier", "happiest" };
+	char *t5[] = { "happiest", "happier", "happy" };
+	char *t6[] = { "no", "nope", "" };
+	char *t7[] = { "", "doesn't matter" };
+
+	cl_git_pass(git_str_common_prefix(&a, t1, 3));
+	cl_assert_equal_s(a.ptr, "");
+
+	cl_git_pass(git_str_common_prefix(&a, t2, 3));
+	cl_assert_equal_s(a.ptr, "some");
+
+	cl_git_pass(git_str_common_prefix(&a, t3, 3));
+	cl_assert_equal_s(a.ptr, "");
+
+	cl_git_pass(git_str_common_prefix(&a, t4, 3));
+	cl_assert_equal_s(a.ptr, "happ");
+
+	cl_git_pass(git_str_common_prefix(&a, t5, 3));
+	cl_assert_equal_s(a.ptr, "happ");
+
+	cl_git_pass(git_str_common_prefix(&a, t6, 3));
+	cl_assert_equal_s(a.ptr, "");
+
+	cl_git_pass(git_str_common_prefix(&a, t7, 3));
+	cl_assert_equal_s(a.ptr, "");
+
+	git_str_dispose(&a);
+}
+
+void test_core_gitstr__rfind_variants(void)
+{
+	git_str a = GIT_STR_INIT;
+	ssize_t len;
+
+	cl_git_pass(git_str_sets(&a, "/this/is/it/"));
+
+	len = (ssize_t)git_str_len(&a);
+
+	cl_assert(git_str_rfind(&a, '/') == len - 1);
+	cl_assert(git_str_rfind_next(&a, '/') == len - 4);
+
+	cl_assert(git_str_rfind(&a, 'i') == len - 3);
+	cl_assert(git_str_rfind_next(&a, 'i') == len - 3);
+
+	cl_assert(git_str_rfind(&a, 'h') == 2);
+	cl_assert(git_str_rfind_next(&a, 'h') == 2);
+
+	cl_assert(git_str_rfind(&a, 'q') == -1);
+	cl_assert(git_str_rfind_next(&a, 'q') == -1);
+
+	git_str_dispose(&a);
+}
+
+void test_core_gitstr__puts_escaped(void)
+{
+	git_str a = GIT_STR_INIT;
+
+	git_str_clear(&a);
+	cl_git_pass(git_str_puts_escaped(&a, "this is a test", "", ""));
+	cl_assert_equal_s("this is a test", a.ptr);
+
+	git_str_clear(&a);
+	cl_git_pass(git_str_puts_escaped(&a, "this is a test", "t", "\\"));
+	cl_assert_equal_s("\\this is a \\tes\\t", a.ptr);
+
+	git_str_clear(&a);
+	cl_git_pass(git_str_puts_escaped(&a, "this is a test", "i ", "__"));
+	cl_assert_equal_s("th__is__ __is__ a__ test", a.ptr);
+
+	git_str_clear(&a);
+	cl_git_pass(git_str_puts_escape_regex(&a, "^match\\s*[A-Z]+.*"));
+	cl_assert_equal_s("\\^match\\\\s\\*\\[A-Z\\]\\+\\.\\*", a.ptr);
+
+	git_str_dispose(&a);
+}
+
+static void assert_unescape(char *expected, char *to_unescape) {
+	git_str buf = GIT_STR_INIT;
+
+	cl_git_pass(git_str_sets(&buf, to_unescape));
+	git_str_unescape(&buf);
+	cl_assert_equal_s(expected, buf.ptr);
+	cl_assert_equal_sz(strlen(expected), buf.size);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__unescape(void)
+{
+	assert_unescape("Escaped\\", "Es\\ca\\ped\\");
+	assert_unescape("Es\\caped\\", "Es\\\\ca\\ped\\\\");
+	assert_unescape("\\", "\\");
+	assert_unescape("\\", "\\\\");
+	assert_unescape("", "");
+}
+
+void test_core_gitstr__encode_base64(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	/*     t  h  i  s
+	 * 0x 74 68 69 73
+     * 0b 01110100 01101000 01101001 01110011
+	 * 0b 011101 000110 100001 101001 011100 110000
+	 * 0x 1d 06 21 29 1c 30
+	 *     d  G  h  p  c  w
+	 */
+	cl_git_pass(git_str_encode_base64(&buf, "this", 4));
+	cl_assert_equal_s("dGhpcw==", buf.ptr);
+
+	git_str_clear(&buf);
+	cl_git_pass(git_str_encode_base64(&buf, "this!", 5));
+	cl_assert_equal_s("dGhpcyE=", buf.ptr);
+
+	git_str_clear(&buf);
+	cl_git_pass(git_str_encode_base64(&buf, "this!\n", 6));
+	cl_assert_equal_s("dGhpcyEK", buf.ptr);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__decode_base64(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	cl_git_pass(git_str_decode_base64(&buf, "dGhpcw==", 8));
+	cl_assert_equal_s("this", buf.ptr);
+
+	git_str_clear(&buf);
+	cl_git_pass(git_str_decode_base64(&buf, "dGhpcyE=", 8));
+	cl_assert_equal_s("this!", buf.ptr);
+
+	git_str_clear(&buf);
+	cl_git_pass(git_str_decode_base64(&buf, "dGhpcyEK", 8));
+	cl_assert_equal_s("this!\n", buf.ptr);
+
+	cl_git_fail(git_str_decode_base64(&buf, "This is not a valid base64 string!!!", 36));
+	cl_assert_equal_s("this!\n", buf.ptr);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__encode_base85(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	cl_git_pass(git_str_encode_base85(&buf, "this", 4));
+	cl_assert_equal_s("bZBXF", buf.ptr);
+	git_str_clear(&buf);
+
+	cl_git_pass(git_str_encode_base85(&buf, "two rnds", 8));
+	cl_assert_equal_s("ba!tca&BaE", buf.ptr);
+	git_str_clear(&buf);
+
+	cl_git_pass(git_str_encode_base85(&buf, "this is base 85 encoded",
+		strlen("this is base 85 encoded")));
+	cl_assert_equal_s("bZBXFAZc?TVqtS-AUHK3Wo~0{WMyOk", buf.ptr);
+	git_str_clear(&buf);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__decode_base85(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	cl_git_pass(git_str_decode_base85(&buf, "bZBXF", 5, 4));
+	cl_assert_equal_sz(4, buf.size);
+	cl_assert_equal_s("this", buf.ptr);
+	git_str_clear(&buf);
+
+	cl_git_pass(git_str_decode_base85(&buf, "ba!tca&BaE", 10, 8));
+	cl_assert_equal_sz(8, buf.size);
+	cl_assert_equal_s("two rnds", buf.ptr);
+	git_str_clear(&buf);
+
+	cl_git_pass(git_str_decode_base85(&buf, "bZBXFAZc?TVqtS-AUHK3Wo~0{WMyOk", 30, 23));
+	cl_assert_equal_sz(23, buf.size);
+	cl_assert_equal_s("this is base 85 encoded", buf.ptr);
+	git_str_clear(&buf);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__decode_base85_fails_gracefully(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	git_str_puts(&buf, "foobar");
+
+	cl_git_fail(git_str_decode_base85(&buf, "invalid charsZZ", 15, 42));
+	cl_git_fail(git_str_decode_base85(&buf, "invalidchars__ ", 15, 42));
+	cl_git_fail(git_str_decode_base85(&buf, "overflowZZ~~~~~", 15, 42));
+	cl_git_fail(git_str_decode_base85(&buf, "truncated", 9, 42));
+	cl_assert_equal_sz(6, buf.size);
+	cl_assert_equal_s("foobar", buf.ptr);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__classify_with_utf8(void)
+{
+	char *data0 = "Simple text\n";
+	size_t data0len = 12;
+	char *data1 = "Is that UTF-8 data I see…\nYep!\n";
+	size_t data1len = 31;
+	char *data2 = "Internal NUL!!!\000\n\nI see you!\n";
+	size_t data2len = 29;
+	char *data3 = "\xef\xbb\xbfThis is UTF-8 with a BOM.\n";
+	size_t data3len = 20;
+	git_str b;
+
+	b.ptr = data0; b.size = b.asize = data0len;
+	cl_assert(!git_str_is_binary(&b));
+	cl_assert(!git_str_contains_nul(&b));
+
+	b.ptr = data1; b.size = b.asize = data1len;
+	cl_assert(!git_str_is_binary(&b));
+	cl_assert(!git_str_contains_nul(&b));
+
+	b.ptr = data2; b.size = b.asize = data2len;
+	cl_assert(git_str_is_binary(&b));
+	cl_assert(git_str_contains_nul(&b));
+
+	b.ptr = data3; b.size = b.asize = data3len;
+	cl_assert(!git_str_is_binary(&b));
+	cl_assert(!git_str_contains_nul(&b));
+}
+
+#define SIMILARITY_TEST_DATA_1 \
+	"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
+	"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
+	"020\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
+	"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
+	"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
+
+void test_core_gitstr__similarity_metric(void)
+{
+	git_hashsig *a, *b;
+	git_str buf = GIT_STR_INIT;
+	int sim;
+
+	/* in the first case, we compare data to itself and expect 100% match */
+
+	cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
+	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+
+	cl_assert_equal_i(100, git_hashsig_compare(a, b));
+
+	git_hashsig_free(a);
+	git_hashsig_free(b);
+
+	/* if we change just a single byte, how much does that change magnify? */
+
+	cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
+	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+	cl_git_pass(git_str_sets(&buf,
+		"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
+		"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
+		"x020x\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
+		"030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
+		"040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
+		));
+	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+
+	sim = git_hashsig_compare(a, b);
+
+	cl_assert_in_range(95, sim, 100); /* expect >95% similarity */
+
+	git_hashsig_free(a);
+	git_hashsig_free(b);
+
+	/* let's try comparing data to a superset of itself */
+
+	cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
+	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+	cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1
+		"050\n051\n052\n053\n054\n055\n056\n057\n058\n059\n"));
+	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+
+	sim = git_hashsig_compare(a, b);
+	/* 20% lines added ~= 10% lines changed */
+
+	cl_assert_in_range(85, sim, 95); /* expect similarity around 90% */
+
+	git_hashsig_free(a);
+	git_hashsig_free(b);
+
+	/* what if we keep about half the original data and add half new */
+
+	cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
+	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+	cl_git_pass(git_str_sets(&buf,
+		"000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
+		"010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
+		"020x\n021\n022\n023\n024\n" \
+		"x25\nx26\nx27\nx28\nx29\n" \
+		"x30\nx31\nx32\nx33\nx34\nx35\nx36\nx37\nx38\nx39\n" \
+		"x40\nx41\nx42\nx43\nx44\nx45\nx46\nx47\nx48\nx49\n"
+		));
+	cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+
+	sim = git_hashsig_compare(a, b);
+	/* 50% lines changed */
+
+	cl_assert_in_range(40, sim, 60); /* expect in the 40-60% similarity range */
+
+	git_hashsig_free(a);
+	git_hashsig_free(b);
+
+	/* lastly, let's check that we can hash file content as well */
+
+	cl_git_pass(git_str_sets(&buf, SIMILARITY_TEST_DATA_1));
+	cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
+
+	cl_git_pass(git_futils_mkdir("scratch", 0755, GIT_MKDIR_PATH));
+	cl_git_mkfile("scratch/testdata", SIMILARITY_TEST_DATA_1);
+	cl_git_pass(git_hashsig_create_fromfile(
+		&b, "scratch/testdata", GIT_HASHSIG_NORMAL));
+
+	cl_assert_equal_i(100, git_hashsig_compare(a, b));
+
+	git_hashsig_free(a);
+	git_hashsig_free(b);
+
+	git_str_dispose(&buf);
+	git_futils_rmdir_r("scratch", NULL, GIT_RMDIR_REMOVE_FILES);
+}
+
+
+void test_core_gitstr__similarity_metric_whitespace(void)
+{
+	git_hashsig *a, *b;
+	git_str buf = GIT_STR_INIT;
+	int sim, i, j;
+	git_hashsig_option_t opt;
+	const char *tabbed =
+		"	for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
+		"		separator = sep[s];\n"
+		"		expect = expect_values[s];\n"
+		"\n"
+		"		for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
+		"			for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
+		"				git_str_join(&buf, separator, a[i], b[j]);\n"
+		"				cl_assert_equal_s(*expect, buf.ptr);\n"
+		"				expect++;\n"
+		"			}\n"
+		"		}\n"
+		"	}\n";
+	const char *spaced =
+		"   for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
+		"       separator = sep[s];\n"
+		"       expect = expect_values[s];\n"
+		"\n"
+		"       for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
+		"           for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
+		"               git_str_join(&buf, separator, a[i], b[j]);\n"
+		"               cl_assert_equal_s(*expect, buf.ptr);\n"
+		"               expect++;\n"
+		"           }\n"
+		"       }\n"
+		"   }\n";
+	const char *crlf_spaced2 =
+		"  for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\r\n"
+		"    separator = sep[s];\r\n"
+		"    expect = expect_values[s];\r\n"
+		"\r\n"
+		"    for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\r\n"
+		"      for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\r\n"
+		"        git_str_join(&buf, separator, a[i], b[j]);\r\n"
+		"        cl_assert_equal_s(*expect, buf.ptr);\r\n"
+		"        expect++;\r\n"
+		"      }\r\n"
+		"    }\r\n"
+		"  }\r\n";
+	const char *text[3] = { tabbed, spaced, crlf_spaced2 };
+
+	/* let's try variations of our own code with whitespace changes */
+
+	for (opt = GIT_HASHSIG_NORMAL; opt <= GIT_HASHSIG_SMART_WHITESPACE; ++opt) {
+		for (i = 0; i < 3; ++i) {
+			for (j = 0; j < 3; ++j) {
+				cl_git_pass(git_str_sets(&buf, text[i]));
+				cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, opt));
+
+				cl_git_pass(git_str_sets(&buf, text[j]));
+				cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, opt));
+
+				sim = git_hashsig_compare(a, b);
+
+				if (opt == GIT_HASHSIG_NORMAL) {
+					if (i == j)
+						cl_assert_equal_i(100, sim);
+					else
+						cl_assert_in_range(0, sim, 30); /* pretty different */
+				} else {
+					cl_assert_equal_i(100, sim);
+				}
+
+				git_hashsig_free(a);
+				git_hashsig_free(b);
+			}
+		}
+	}
+
+	git_str_dispose(&buf);
+}
+
+#include "../filter/crlf.h"
+
+#define check_buf(expected,buf) do { \
+	cl_assert_equal_s(expected, buf.ptr); \
+	cl_assert_equal_sz(strlen(expected), buf.size); } while (0)
+
+void test_core_gitstr__lf_and_crlf_conversions(void)
+{
+	git_str src = GIT_STR_INIT, tgt = GIT_STR_INIT;
+
+	/* LF source */
+
+	git_str_sets(&src, "lf\nlf\nlf\nlf\n");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("lf\r\nlf\r\nlf\r\nlf\r\n", tgt);
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf(src.ptr, tgt);
+
+	git_str_sets(&src, "\nlf\nlf\nlf\nlf\nlf");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("\r\nlf\r\nlf\r\nlf\r\nlf\r\nlf", tgt);
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf(src.ptr, tgt);
+
+	/* CRLF source */
+
+	git_str_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n", tgt);
+
+	git_str_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf("crlf\ncrlf\ncrlf\ncrlf\n", tgt);
+
+	git_str_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf", tgt);
+
+	git_str_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf("\ncrlf\ncrlf\ncrlf\ncrlf\ncrlf", tgt);
+
+	/* CRLF in LF text */
+
+	git_str_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("\r\nlf\r\nlf\r\ncrlf\r\nlf\r\nlf\r\ncrlf\r\n", tgt);
+
+	git_str_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf("\nlf\nlf\ncrlf\nlf\nlf\ncrlf\n", tgt);
+
+	/* LF in CRLF text */
+
+	git_str_sets(&src, "\ncrlf\r\ncrlf\r\nlf\ncrlf\r\ncrlf");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("\r\ncrlf\r\ncrlf\r\nlf\r\ncrlf\r\ncrlf", tgt);
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf("\ncrlf\ncrlf\nlf\ncrlf\ncrlf", tgt);
+
+	/* bare CR test */
+
+	git_str_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");
+
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf("\rcrlf\r\nlf\r\nlf\r\ncr\rcrlf\r\nlf\r\ncr\r", tgt);
+
+	git_str_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");
+
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf("\rcrlf\nlf\nlf\ncr\rcrlf\nlf\ncr\r", tgt);
+
+	git_str_sets(&src, "\rcr\r");
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf(src.ptr, tgt);
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf("\rcr\r", tgt);
+
+	git_str_dispose(&src);
+	git_str_dispose(&tgt);
+
+	/* blob correspondence tests */
+
+	git_str_sets(&src, ALL_CRLF_TEXT_RAW);
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf(ALL_CRLF_TEXT_AS_CRLF, tgt);
+	git_str_sets(&src, ALL_CRLF_TEXT_RAW);
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf(ALL_CRLF_TEXT_AS_LF, tgt);
+	git_str_dispose(&src);
+	git_str_dispose(&tgt);
+
+	git_str_sets(&src, ALL_LF_TEXT_RAW);
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf(ALL_LF_TEXT_AS_CRLF, tgt);
+	git_str_sets(&src, ALL_LF_TEXT_RAW);
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf(ALL_LF_TEXT_AS_LF, tgt);
+	git_str_dispose(&src);
+	git_str_dispose(&tgt);
+
+	git_str_sets(&src, MORE_CRLF_TEXT_RAW);
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf(MORE_CRLF_TEXT_AS_CRLF, tgt);
+	git_str_sets(&src, MORE_CRLF_TEXT_RAW);
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf(MORE_CRLF_TEXT_AS_LF, tgt);
+	git_str_dispose(&src);
+	git_str_dispose(&tgt);
+
+	git_str_sets(&src, MORE_LF_TEXT_RAW);
+	cl_git_pass(git_str_lf_to_crlf(&tgt, &src));
+	check_buf(MORE_LF_TEXT_AS_CRLF, tgt);
+	git_str_sets(&src, MORE_LF_TEXT_RAW);
+	cl_git_pass(git_str_crlf_to_lf(&tgt, &src));
+	check_buf(MORE_LF_TEXT_AS_LF, tgt);
+	git_str_dispose(&src);
+	git_str_dispose(&tgt);
+}
+
+void test_core_gitstr__dont_grow_borrowed(void)
+{
+	const char *somestring = "blah blah";
+	git_str buf = GIT_STR_INIT;
+
+	git_str_attach_notowned(&buf, somestring, strlen(somestring) + 1);
+	cl_assert_equal_p(somestring, buf.ptr);
+	cl_assert_equal_i(0, buf.asize);
+	cl_assert_equal_i(strlen(somestring) + 1, buf.size);
+
+	cl_git_fail_with(GIT_EINVALID, git_str_grow(&buf, 1024));
+}
+
+void test_core_gitstr__dont_hit_infinite_loop_when_resizing(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	cl_git_pass(git_str_puts(&buf, "foobar"));
+	/*
+	 * We do not care whether this succeeds or fails, which
+	 * would depend on platform-specific allocation
+	 * semantics. We only want to know that the function
+	 * actually returns.
+	 */
+	(void)git_str_try_grow(&buf, SIZE_MAX, true);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_gitstr__avoid_printing_into_oom_buffer(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	/* Emulate OOM situation with a previous allocation */
+	buf.asize = 8;
+	buf.ptr = git_str__oom;
+
+	/*
+	 * Print the same string again. As the buffer still has
+	 * an `asize` of 8 due to the previous print,
+	 * `ENSURE_SIZE` would not try to reallocate the array at
+	 * all. As it didn't explicitly check for `git_str__oom`
+	 * in earlier versions, this would've resulted in it
+	 * returning successfully and thus `git_str_puts` would
+	 * just print into the `git_str__oom` array.
+	 */
+	cl_git_fail(git_str_puts(&buf, "foobar"));
+}
diff --git a/tests/libgit2/core/hex.c b/tests/libgit2/core/hex.c
new file mode 100644
index 000000000..930af1670
--- /dev/null
+++ b/tests/libgit2/core/hex.c
@@ -0,0 +1,22 @@
+#include "clar_libgit2.h"
+#include "util.h"
+
+void test_core_hex__fromhex(void)
+{
+	/* Passing cases */
+	cl_assert(git__fromhex('0') == 0x0);
+	cl_assert(git__fromhex('1') == 0x1);
+	cl_assert(git__fromhex('3') == 0x3);
+	cl_assert(git__fromhex('9') == 0x9);
+	cl_assert(git__fromhex('A') == 0xa);
+	cl_assert(git__fromhex('C') == 0xc);
+	cl_assert(git__fromhex('F') == 0xf);
+	cl_assert(git__fromhex('a') == 0xa);
+	cl_assert(git__fromhex('c') == 0xc);
+	cl_assert(git__fromhex('f') == 0xf);
+
+	/* Failing cases */
+	cl_assert(git__fromhex('g') == -1);
+	cl_assert(git__fromhex('z') == -1);
+	cl_assert(git__fromhex('X') == -1);
+}
diff --git a/tests/libgit2/core/iconv.c b/tests/libgit2/core/iconv.c
new file mode 100644
index 000000000..af1b4eabf
--- /dev/null
+++ b/tests/libgit2/core/iconv.c
@@ -0,0 +1,78 @@
+#include "clar_libgit2.h"
+#include "fs_path.h"
+
+#ifdef GIT_USE_ICONV
+static git_fs_path_iconv_t ic;
+static char *nfc = "\xC3\x85\x73\x74\x72\xC3\xB6\x6D";
+static char *nfd = "\x41\xCC\x8A\x73\x74\x72\x6F\xCC\x88\x6D";
+#endif
+
+void test_core_iconv__initialize(void)
+{
+#ifdef GIT_USE_ICONV
+	cl_git_pass(git_fs_path_iconv_init_precompose(&ic));
+#endif
+}
+
+void test_core_iconv__cleanup(void)
+{
+#ifdef GIT_USE_ICONV
+	git_fs_path_iconv_clear(&ic);
+#endif
+}
+
+void test_core_iconv__unchanged(void)
+{
+#ifdef GIT_USE_ICONV
+	const char *data = "Ascii data", *original = data;
+	size_t datalen = strlen(data);
+
+	cl_git_pass(git_fs_path_iconv(&ic, &data, &datalen));
+	GIT_UNUSED(datalen);
+
+	/* There are no high bits set, so this should leave data untouched */
+	cl_assert(data == original);
+#endif
+}
+
+void test_core_iconv__decomposed_to_precomposed(void)
+{
+#ifdef GIT_USE_ICONV
+	const char *data = nfd;
+	size_t datalen, nfdlen = strlen(nfd);
+
+	datalen = nfdlen;
+	cl_git_pass(git_fs_path_iconv(&ic, &data, &datalen));
+	GIT_UNUSED(datalen);
+
+	/* The decomposed nfd string should be transformed to the nfc form
+	 * (on platforms where iconv is enabled, of course).
+	 */
+	cl_assert_equal_s(nfc, data);
+
+	/* should be able to do it multiple times with the same git_fs_path_iconv_t */
+	data = nfd; datalen = nfdlen;
+	cl_git_pass(git_fs_path_iconv(&ic, &data, &datalen));
+	cl_assert_equal_s(nfc, data);
+
+	data = nfd; datalen = nfdlen;
+	cl_git_pass(git_fs_path_iconv(&ic, &data, &datalen));
+	cl_assert_equal_s(nfc, data);
+#endif
+}
+
+void test_core_iconv__precomposed_is_unmodified(void)
+{
+#ifdef GIT_USE_ICONV
+	const char *data = nfc;
+	size_t datalen = strlen(nfc);
+
+	cl_git_pass(git_fs_path_iconv(&ic, &data, &datalen));
+	GIT_UNUSED(datalen);
+
+	/* data is already in precomposed form, so even though some bytes have
+	 * the high-bit set, the iconv transform should result in no change.
+	 */
+	cl_assert_equal_s(nfc, data);
+#endif
+}
diff --git a/tests/libgit2/core/init.c b/tests/libgit2/core/init.c
new file mode 100644
index 000000000..eba77ef52
--- /dev/null
+++ b/tests/libgit2/core/init.c
@@ -0,0 +1,54 @@
+#include "clar_libgit2.h"
+
+void test_core_init__returns_count(void)
+{
+	/* libgit2_tests initializes us first, so we have an existing
+	 * initialization.
+	 */
+	cl_assert_equal_i(2, git_libgit2_init());
+	cl_assert_equal_i(3, git_libgit2_init());
+
+	cl_assert_equal_i(2, git_libgit2_shutdown());
+	cl_assert_equal_i(1, git_libgit2_shutdown());
+}
+
+void test_core_init__reinit_succeeds(void)
+{
+	cl_assert_equal_i(0, git_libgit2_shutdown());
+	cl_assert_equal_i(1, git_libgit2_init());
+	cl_sandbox_set_search_path_defaults();
+}
+
+#ifdef GIT_THREADS
+static void *reinit(void *unused)
+{
+	unsigned i;
+
+	for (i = 0; i < 20; i++) {
+		cl_assert(git_libgit2_init() > 0);
+		cl_assert(git_libgit2_shutdown() >= 0);
+	}
+
+	return unused;
+}
+#endif
+
+void test_core_init__concurrent_init_succeeds(void)
+{
+#ifdef GIT_THREADS
+	git_thread threads[10];
+	unsigned i;
+
+	cl_assert_equal_i(2, git_libgit2_init());
+
+	for (i = 0; i < ARRAY_SIZE(threads); i++)
+		git_thread_create(&threads[i], reinit, NULL);
+	for (i = 0; i < ARRAY_SIZE(threads); i++)
+		git_thread_join(&threads[i], NULL);
+
+	cl_assert_equal_i(1, git_libgit2_shutdown());
+	cl_sandbox_set_search_path_defaults();
+#else
+	cl_skip();
+#endif
+}
diff --git a/tests/libgit2/core/integer.c b/tests/libgit2/core/integer.c
new file mode 100644
index 000000000..18364ba62
--- /dev/null
+++ b/tests/libgit2/core/integer.c
@@ -0,0 +1,253 @@
+#include "clar_libgit2.h"
+
+void test_core_integer__multiply_int64_no_overflow(void)
+{
+#if !defined(git__multiply_int64_overflow)
+	int64_t result = 0;
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(-0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(-0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(0x7fffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(-0x7fffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x0), INT64_C(-0x8000000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(0x1));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x1));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(-0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(-0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(-0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(-0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(0x7fffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(-0x7fffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(-0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x1));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(0x1));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(-0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(-0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(-0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(-0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(0x7fffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(-0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(-0x7fffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(0x4));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x4));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(-0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(-0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(0x2));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x4));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(0x4));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(-0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(-0x7ffffffffffffff)));
+	cl_assert_equal_i(result, INT64_C(0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(-0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(-0x800000000000000)));
+	cl_assert_equal_i(result, INT64_C(0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x4000000000000000)));
+	cl_assert_equal_i(result, INT64_C(-0x8000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(-0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(0x7ffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(-0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(0xffffffffffffffe));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(0x800000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(-0x2)));
+	cl_assert_equal_i(result, INT64_C(0x1000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x4000000000000000), INT64_C(0x2)));
+	cl_assert_equal_i(result, INT64_C(-0x8000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(0x7fffffffffffffff));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(0x0)));
+	cl_assert_equal_i(result, INT64_C(0x0));
+#endif
+}
+
+void test_core_integer__multiply_int64_overflow(void)
+{
+#if !defined(git__multiply_int64_overflow)
+	int64_t result = 0;
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x4000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x2), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x2), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7ffffffffffffff), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7ffffffffffffff), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x800000000000000), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x800000000000000), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x4000000000000000), INT64_C(0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(-0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x7fffffffffffffff), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(-0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x7fffffffffffffff), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(-0x2)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(-0x7ffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(-0x800000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(-0x7fffffffffffffff)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(-0x8000000000000000)));
+#endif
+}
+
+void test_core_integer__multiply_int64_edge_cases(void)
+{
+#if !defined(git__multiply_int64_overflow)
+	int64_t result = 0;
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(-0x1)));
+	cl_assert_equal_i(result, INT64_C(-0x8000000000000000));
+	cl_assert(!git__multiply_int64_overflow(&result, INT64_C(-0x1), INT64_C(-0x8000000000000000)));
+	cl_assert_equal_i(result, INT64_C(-0x8000000000000000));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(0x1), INT64_C(-0x8000000000000000)));
+	cl_assert(git__multiply_int64_overflow(&result, INT64_C(-0x8000000000000000), INT64_C(0x1)));
+#endif
+}
diff --git a/tests/libgit2/core/link.c b/tests/libgit2/core/link.c
new file mode 100644
index 000000000..a1e2706b2
--- /dev/null
+++ b/tests/libgit2/core/link.c
@@ -0,0 +1,630 @@
+#include "clar_libgit2.h"
+#include "posix.h"
+
+#ifdef GIT_WIN32
+# include "win32/reparse.h"
+#endif
+
+void test_core_link__cleanup(void)
+{
+#ifdef GIT_WIN32
+	RemoveDirectory("lstat_junction");
+	RemoveDirectory("lstat_dangling");
+	RemoveDirectory("lstat_dangling_dir");
+	RemoveDirectory("lstat_dangling_junction");
+
+	RemoveDirectory("stat_junction");
+	RemoveDirectory("stat_dangling");
+	RemoveDirectory("stat_dangling_dir");
+	RemoveDirectory("stat_dangling_junction");
+#endif
+}
+
+#ifdef GIT_WIN32
+static bool should_run(void)
+{
+	static SID_IDENTIFIER_AUTHORITY authority = { SECURITY_NT_AUTHORITY };
+	PSID admin_sid;
+	BOOL is_admin;
+
+	cl_win32_pass(AllocateAndInitializeSid(&authority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &admin_sid));
+	cl_win32_pass(CheckTokenMembership(NULL, admin_sid, &is_admin));
+	FreeSid(admin_sid);
+
+	return is_admin ? true : false;
+}
+#else
+static bool should_run(void)
+{
+	return true;
+}
+#endif
+
+static void do_symlink(const char *old, const char *new, int is_dir)
+{
+#ifndef GIT_WIN32
+	GIT_UNUSED(is_dir);
+
+	cl_must_pass(symlink(old, new));
+#else
+	typedef DWORD (WINAPI *create_symlink_func)(LPCTSTR, LPCTSTR, DWORD);
+	HMODULE module;
+	create_symlink_func pCreateSymbolicLink;
+
+	cl_assert(module = GetModuleHandle("kernel32"));
+	cl_assert(pCreateSymbolicLink = (create_symlink_func)(void *)GetProcAddress(module, "CreateSymbolicLinkA"));
+
+	cl_win32_pass(pCreateSymbolicLink(new, old, is_dir));
+#endif
+}
+
+static void do_hardlink(const char *old, const char *new)
+{
+#ifndef GIT_WIN32
+	cl_must_pass(link(old, new));
+#else
+	typedef DWORD (WINAPI *create_hardlink_func)(LPCTSTR, LPCTSTR, LPSECURITY_ATTRIBUTES);
+	HMODULE module;
+	create_hardlink_func pCreateHardLink;
+
+	cl_assert(module = GetModuleHandle("kernel32"));
+	cl_assert(pCreateHardLink = (create_hardlink_func)(void *)GetProcAddress(module, "CreateHardLinkA"));
+
+	cl_win32_pass(pCreateHardLink(new, old, 0));
+#endif
+}
+
+#ifdef GIT_WIN32
+
+static void do_junction(const char *old, const char *new)
+{
+	GIT_REPARSE_DATA_BUFFER *reparse_buf;
+	HANDLE handle;
+	git_str unparsed_buf = GIT_STR_INIT;
+	wchar_t *subst_utf16, *print_utf16;
+	DWORD ioctl_ret;
+	int subst_utf16_len, subst_byte_len, print_utf16_len, print_byte_len, ret;
+	USHORT reparse_buflen;
+	size_t i;
+
+	/* Junction targets must be the unparsed name, starting with \??\, using
+	 * backslashes instead of forward, and end in a trailing backslash.
+	 * eg: \??\C:\Foo\
+	 */
+	git_str_puts(&unparsed_buf, "\\??\\");
+
+	for (i = 0; i < strlen(old); i++)
+		git_str_putc(&unparsed_buf, old[i] == '/' ? '\\' : old[i]);
+
+	git_str_putc(&unparsed_buf, '\\');
+
+	subst_utf16_len = git__utf8_to_16(NULL, 0, git_str_cstr(&unparsed_buf));
+	subst_byte_len = subst_utf16_len * sizeof(WCHAR);
+
+	print_utf16_len = subst_utf16_len - 4;
+	print_byte_len = subst_byte_len - (4 * sizeof(WCHAR));
+
+	/* The junction must be an empty directory before the junction attribute
+	 * can be added.
+	 */
+	cl_win32_pass(CreateDirectoryA(new, NULL));
+
+	handle = CreateFileA(new, GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
+		FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, NULL);
+	cl_win32_pass(handle != INVALID_HANDLE_VALUE);
+
+	reparse_buflen = (USHORT)(REPARSE_DATA_HEADER_SIZE +
+		REPARSE_DATA_MOUNTPOINT_HEADER_SIZE +
+		subst_byte_len + sizeof(WCHAR) +
+		print_byte_len + sizeof(WCHAR));
+
+	reparse_buf = LocalAlloc(LMEM_FIXED|LMEM_ZEROINIT, reparse_buflen);
+	cl_assert(reparse_buf);
+
+	subst_utf16 = reparse_buf->ReparseBuffer.MountPoint.PathBuffer;
+	print_utf16 = subst_utf16 + subst_utf16_len + 1;
+
+	ret = git__utf8_to_16(subst_utf16, subst_utf16_len + 1,
+		git_str_cstr(&unparsed_buf));
+	cl_assert_equal_i(subst_utf16_len, ret);
+
+	ret = git__utf8_to_16(print_utf16,
+		print_utf16_len + 1, git_str_cstr(&unparsed_buf) + 4);
+	cl_assert_equal_i(print_utf16_len, ret);
+
+	reparse_buf->ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
+	reparse_buf->ReparseBuffer.MountPoint.SubstituteNameOffset = 0;
+	reparse_buf->ReparseBuffer.MountPoint.SubstituteNameLength = subst_byte_len;
+	reparse_buf->ReparseBuffer.MountPoint.PrintNameOffset = (USHORT)(subst_byte_len + sizeof(WCHAR));
+	reparse_buf->ReparseBuffer.MountPoint.PrintNameLength = print_byte_len;
+	reparse_buf->ReparseDataLength = reparse_buflen - REPARSE_DATA_HEADER_SIZE;
+
+	cl_win32_pass(DeviceIoControl(handle, FSCTL_SET_REPARSE_POINT,
+		reparse_buf, reparse_buflen, NULL, 0, &ioctl_ret, NULL));
+
+	CloseHandle(handle);
+	LocalFree(reparse_buf);
+
+	git_str_dispose(&unparsed_buf);
+}
+
+static void do_custom_reparse(const char *path)
+{
+	REPARSE_GUID_DATA_BUFFER *reparse_buf;
+	HANDLE handle;
+	DWORD ioctl_ret;
+
+	const char *reparse_data = "Reparse points are silly.";
+	size_t reparse_buflen = REPARSE_GUID_DATA_BUFFER_HEADER_SIZE +
+		strlen(reparse_data) + 1;
+
+	reparse_buf = LocalAlloc(LMEM_FIXED|LMEM_ZEROINIT, reparse_buflen);
+	cl_assert(reparse_buf);
+
+	reparse_buf->ReparseTag = 42;
+	reparse_buf->ReparseDataLength = (WORD)(strlen(reparse_data) + 1);
+
+	reparse_buf->ReparseGuid.Data1 = 0xdeadbeef;
+	reparse_buf->ReparseGuid.Data2 = 0xdead;
+	reparse_buf->ReparseGuid.Data3 = 0xbeef;
+	reparse_buf->ReparseGuid.Data4[0] = 42;
+	reparse_buf->ReparseGuid.Data4[1] = 42;
+	reparse_buf->ReparseGuid.Data4[2] = 42;
+	reparse_buf->ReparseGuid.Data4[3] = 42;
+	reparse_buf->ReparseGuid.Data4[4] = 42;
+	reparse_buf->ReparseGuid.Data4[5] = 42;
+	reparse_buf->ReparseGuid.Data4[6] = 42;
+	reparse_buf->ReparseGuid.Data4[7] = 42;
+	reparse_buf->ReparseGuid.Data4[8] = 42;
+
+	memcpy(reparse_buf->GenericReparseBuffer.DataBuffer,
+		reparse_data, strlen(reparse_data) + 1);
+
+	handle = CreateFileA(path, GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
+		FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, NULL);
+	cl_win32_pass(handle != INVALID_HANDLE_VALUE);
+
+	cl_win32_pass(DeviceIoControl(handle, FSCTL_SET_REPARSE_POINT,
+		reparse_buf,
+		reparse_buf->ReparseDataLength + REPARSE_GUID_DATA_BUFFER_HEADER_SIZE,
+		NULL, 0, &ioctl_ret, NULL));
+
+	CloseHandle(handle);
+	LocalFree(reparse_buf);
+}
+
+#endif
+
+void test_core_link__stat_regular_file(void)
+{
+	struct stat st;
+
+	cl_git_rewritefile("stat_regfile", "This is a regular file!\n");
+
+	cl_must_pass(p_stat("stat_regfile", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(24, st.st_size);
+}
+
+void test_core_link__lstat_regular_file(void)
+{
+	struct stat st;
+
+	cl_git_rewritefile("lstat_regfile", "This is a regular file!\n");
+
+	cl_must_pass(p_stat("lstat_regfile", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(24, st.st_size);
+}
+
+void test_core_link__stat_symlink(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	cl_git_rewritefile("stat_target", "This is the target of a symbolic link.\n");
+	do_symlink("stat_target", "stat_symlink", 0);
+
+	cl_must_pass(p_stat("stat_target", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(39, st.st_size);
+
+	cl_must_pass(p_stat("stat_symlink", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(39, st.st_size);
+}
+
+void test_core_link__stat_symlink_directory(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	p_mkdir("stat_dirtarget", 0777);
+	do_symlink("stat_dirtarget", "stat_dirlink", 1);
+
+	cl_must_pass(p_stat("stat_dirtarget", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+
+	cl_must_pass(p_stat("stat_dirlink", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+}
+
+void test_core_link__stat_symlink_chain(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	cl_git_rewritefile("stat_final_target", "Final target of some symbolic links...\n");
+	do_symlink("stat_final_target", "stat_chain_3", 0);
+	do_symlink("stat_chain_3", "stat_chain_2", 0);
+	do_symlink("stat_chain_2", "stat_chain_1", 0);
+
+	cl_must_pass(p_stat("stat_chain_1", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(39, st.st_size);
+}
+
+void test_core_link__stat_dangling_symlink(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	do_symlink("stat_nonexistent", "stat_dangling", 0);
+
+	cl_must_fail(p_stat("stat_nonexistent", &st));
+	cl_must_fail(p_stat("stat_dangling", &st));
+}
+
+void test_core_link__stat_dangling_symlink_directory(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	do_symlink("stat_nonexistent", "stat_dangling_dir", 1);
+
+	cl_must_fail(p_stat("stat_nonexistent_dir", &st));
+	cl_must_fail(p_stat("stat_dangling", &st));
+}
+
+void test_core_link__lstat_symlink(void)
+{
+	git_str target_path = GIT_STR_INIT;
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	/* Windows always writes the canonical path as the link target, so
+	 * write the full path on all platforms.
+	 */
+	git_str_join(&target_path, '/', clar_sandbox_path(), "lstat_target");
+
+	cl_git_rewritefile("lstat_target", "This is the target of a symbolic link.\n");
+	do_symlink(git_str_cstr(&target_path), "lstat_symlink", 0);
+
+	cl_must_pass(p_lstat("lstat_target", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(39, st.st_size);
+
+	cl_must_pass(p_lstat("lstat_symlink", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+	cl_assert_equal_i(git_str_len(&target_path), st.st_size);
+
+	git_str_dispose(&target_path);
+}
+
+void test_core_link__lstat_symlink_directory(void)
+{
+	git_str target_path = GIT_STR_INIT;
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "lstat_dirtarget");
+
+	p_mkdir("lstat_dirtarget", 0777);
+	do_symlink(git_str_cstr(&target_path), "lstat_dirlink", 1);
+
+	cl_must_pass(p_lstat("lstat_dirtarget", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+
+	cl_must_pass(p_lstat("lstat_dirlink", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+	cl_assert_equal_i(git_str_len(&target_path), st.st_size);
+
+	git_str_dispose(&target_path);
+}
+
+void test_core_link__lstat_dangling_symlink(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	do_symlink("lstat_nonexistent", "lstat_dangling", 0);
+
+	cl_must_fail(p_lstat("lstat_nonexistent", &st));
+
+	cl_must_pass(p_lstat("lstat_dangling", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+	cl_assert_equal_i(strlen("lstat_nonexistent"), st.st_size);
+}
+
+void test_core_link__lstat_dangling_symlink_directory(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	do_symlink("lstat_nonexistent", "lstat_dangling_dir", 1);
+
+	cl_must_fail(p_lstat("lstat_nonexistent", &st));
+
+	cl_must_pass(p_lstat("lstat_dangling_dir", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+	cl_assert_equal_i(strlen("lstat_nonexistent"), st.st_size);
+}
+
+void test_core_link__stat_junction(void)
+{
+#ifdef GIT_WIN32
+	git_str target_path = GIT_STR_INIT;
+	struct stat st;
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "stat_junctarget");
+
+	p_mkdir("stat_junctarget", 0777);
+	do_junction(git_str_cstr(&target_path), "stat_junction");
+
+	cl_must_pass(p_stat("stat_junctarget", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+
+	cl_must_pass(p_stat("stat_junction", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+
+	git_str_dispose(&target_path);
+#endif
+}
+
+void test_core_link__stat_dangling_junction(void)
+{
+#ifdef GIT_WIN32
+	git_str target_path = GIT_STR_INIT;
+	struct stat st;
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "stat_nonexistent_junctarget");
+
+	p_mkdir("stat_nonexistent_junctarget", 0777);
+	do_junction(git_str_cstr(&target_path), "stat_dangling_junction");
+
+	RemoveDirectory("stat_nonexistent_junctarget");
+
+	cl_must_fail(p_stat("stat_nonexistent_junctarget", &st));
+	cl_must_fail(p_stat("stat_dangling_junction", &st));
+
+	git_str_dispose(&target_path);
+#endif
+}
+
+void test_core_link__lstat_junction(void)
+{
+#ifdef GIT_WIN32
+	git_str target_path = GIT_STR_INIT;
+	struct stat st;
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "lstat_junctarget");
+
+	p_mkdir("lstat_junctarget", 0777);
+	do_junction(git_str_cstr(&target_path), "lstat_junction");
+
+	cl_must_pass(p_lstat("lstat_junctarget", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+
+	cl_must_pass(p_lstat("lstat_junction", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+
+	git_str_dispose(&target_path);
+#endif
+}
+
+void test_core_link__lstat_dangling_junction(void)
+{
+#ifdef GIT_WIN32
+	git_str target_path = GIT_STR_INIT;
+	struct stat st;
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "lstat_nonexistent_junctarget");
+
+	p_mkdir("lstat_nonexistent_junctarget", 0777);
+	do_junction(git_str_cstr(&target_path), "lstat_dangling_junction");
+
+	RemoveDirectory("lstat_nonexistent_junctarget");
+
+	cl_must_fail(p_lstat("lstat_nonexistent_junctarget", &st));
+
+	cl_must_pass(p_lstat("lstat_dangling_junction", &st));
+	cl_assert(S_ISLNK(st.st_mode));
+	cl_assert_equal_i(git_str_len(&target_path), st.st_size);
+
+	git_str_dispose(&target_path);
+#endif
+}
+
+void test_core_link__stat_hardlink(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	cl_git_rewritefile("stat_hardlink1", "This file has many names!\n");
+	do_hardlink("stat_hardlink1", "stat_hardlink2");
+
+	cl_must_pass(p_stat("stat_hardlink1", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(26, st.st_size);
+
+	cl_must_pass(p_stat("stat_hardlink2", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(26, st.st_size);
+}
+
+void test_core_link__lstat_hardlink(void)
+{
+	struct stat st;
+
+	if (!should_run())
+		clar__skip();
+
+	cl_git_rewritefile("lstat_hardlink1", "This file has many names!\n");
+	do_hardlink("lstat_hardlink1", "lstat_hardlink2");
+
+	cl_must_pass(p_lstat("lstat_hardlink1", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(26, st.st_size);
+
+	cl_must_pass(p_lstat("lstat_hardlink2", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(26, st.st_size);
+}
+
+void test_core_link__stat_reparse_point(void)
+{
+#ifdef GIT_WIN32
+	struct stat st;
+
+	/* Generic reparse points should be treated as regular files, only
+	 * symlinks and junctions should be treated as links.
+	 */
+
+	cl_git_rewritefile("stat_reparse", "This is a reparse point!\n");
+	do_custom_reparse("stat_reparse");
+
+	cl_must_pass(p_lstat("stat_reparse", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(25, st.st_size);
+#endif
+}
+
+void test_core_link__lstat_reparse_point(void)
+{
+#ifdef GIT_WIN32
+	struct stat st;
+
+	cl_git_rewritefile("lstat_reparse", "This is a reparse point!\n");
+	do_custom_reparse("lstat_reparse");
+
+	cl_must_pass(p_lstat("lstat_reparse", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_equal_i(25, st.st_size);
+#endif
+}
+
+void test_core_link__readlink_nonexistent_file(void)
+{
+	char buf[2048];
+
+	cl_must_fail(p_readlink("readlink_nonexistent", buf, 2048));
+	cl_assert_equal_i(ENOENT, errno);
+}
+
+void test_core_link__readlink_normal_file(void)
+{
+	char buf[2048];
+
+	cl_git_rewritefile("readlink_regfile", "This is a regular file!\n");
+	cl_must_fail(p_readlink("readlink_regfile", buf, 2048));
+	cl_assert_equal_i(EINVAL, errno);
+}
+
+void test_core_link__readlink_symlink(void)
+{
+	git_str target_path = GIT_STR_INIT;
+	int len;
+	char buf[2048];
+
+	if (!should_run())
+		clar__skip();
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "readlink_target");
+
+	cl_git_rewritefile("readlink_target", "This is the target of a symlink\n");
+	do_symlink(git_str_cstr(&target_path), "readlink_link", 0);
+
+	len = p_readlink("readlink_link", buf, 2048);
+	cl_must_pass(len);
+
+	buf[len] = 0;
+
+	cl_assert_equal_s(git_str_cstr(&target_path), buf);
+
+	git_str_dispose(&target_path);
+}
+
+void test_core_link__readlink_dangling(void)
+{
+	git_str target_path = GIT_STR_INIT;
+	int len;
+	char buf[2048];
+
+	if (!should_run())
+		clar__skip();
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "readlink_nonexistent");
+
+	do_symlink(git_str_cstr(&target_path), "readlink_dangling", 0);
+
+	len = p_readlink("readlink_dangling", buf, 2048);
+	cl_must_pass(len);
+
+	buf[len] = 0;
+
+	cl_assert_equal_s(git_str_cstr(&target_path), buf);
+
+	git_str_dispose(&target_path);
+}
+
+void test_core_link__readlink_multiple(void)
+{
+	git_str target_path = GIT_STR_INIT,
+		path3 = GIT_STR_INIT, path2 = GIT_STR_INIT, path1 = GIT_STR_INIT;
+	int len;
+	char buf[2048];
+
+	if (!should_run())
+		clar__skip();
+
+	git_str_join(&target_path, '/', clar_sandbox_path(), "readlink_final");
+	git_str_join(&path3, '/', clar_sandbox_path(), "readlink_3");
+	git_str_join(&path2, '/', clar_sandbox_path(), "readlink_2");
+	git_str_join(&path1, '/', clar_sandbox_path(), "readlink_1");
+
+	do_symlink(git_str_cstr(&target_path), git_str_cstr(&path3), 0);
+	do_symlink(git_str_cstr(&path3), git_str_cstr(&path2), 0);
+	do_symlink(git_str_cstr(&path2), git_str_cstr(&path1), 0);
+
+	len = p_readlink("readlink_1", buf, 2048);
+	cl_must_pass(len);
+
+	buf[len] = 0;
+
+	cl_assert_equal_s(git_str_cstr(&path2), buf);
+
+	git_str_dispose(&path1);
+	git_str_dispose(&path2);
+	git_str_dispose(&path3);
+	git_str_dispose(&target_path);
+}
diff --git a/tests/libgit2/core/memmem.c b/tests/libgit2/core/memmem.c
new file mode 100644
index 000000000..fd9986d01
--- /dev/null
+++ b/tests/libgit2/core/memmem.c
@@ -0,0 +1,46 @@
+#include "clar_libgit2.h"
+
+static void assert_found(const char *haystack, const char *needle, size_t expected_pos)
+{
+	cl_assert_equal_p(git__memmem(haystack, haystack ? strlen(haystack) : 0,
+				      needle, needle ? strlen(needle) : 0),
+			  haystack + expected_pos);
+}
+
+static void assert_absent(const char *haystack, const char *needle)
+{
+	cl_assert_equal_p(git__memmem(haystack, haystack ? strlen(haystack) : 0,
+				      needle, needle ? strlen(needle) : 0),
+			  NULL);
+}
+
+void test_core_memmem__found(void)
+{
+	assert_found("a", "a", 0);
+	assert_found("ab", "a", 0);
+	assert_found("ba", "a", 1);
+	assert_found("aa", "a", 0);
+	assert_found("aab", "aa", 0);
+	assert_found("baa", "aa", 1);
+	assert_found("dabc", "abc", 1);
+	assert_found("abababc", "abc", 4);
+}
+
+void test_core_memmem__absent(void)
+{
+	assert_absent("a", "b");
+	assert_absent("a", "aa");
+	assert_absent("ba", "ab");
+	assert_absent("ba", "ab");
+	assert_absent("abc", "abcd");
+	assert_absent("abcabcabc", "bcac");
+}
+
+void test_core_memmem__edgecases(void)
+{
+	assert_absent(NULL, NULL);
+	assert_absent("a", NULL);
+	assert_absent(NULL, "a");
+	assert_absent("", "a");
+	assert_absent("a", "");
+}
diff --git a/tests/libgit2/core/mkdir.c b/tests/libgit2/core/mkdir.c
new file mode 100644
index 000000000..58a4cfcdb
--- /dev/null
+++ b/tests/libgit2/core/mkdir.c
@@ -0,0 +1,291 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+#include "posix.h"
+
+static void cleanup_basic_dirs(void *ref)
+{
+	GIT_UNUSED(ref);
+	git_futils_rmdir_r("d0", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+	git_futils_rmdir_r("d1", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+	git_futils_rmdir_r("d2", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+	git_futils_rmdir_r("d3", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+	git_futils_rmdir_r("d4", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+}
+
+void test_core_mkdir__absolute(void)
+{
+	git_str path = GIT_STR_INIT;
+
+	cl_set_cleanup(cleanup_basic_dirs, NULL);
+
+	git_str_joinpath(&path, clar_sandbox_path(), "d0");
+
+	/* make a directory */
+	cl_assert(!git_fs_path_isdir(path.ptr));
+	cl_git_pass(git_futils_mkdir(path.ptr, 0755, 0));
+	cl_assert(git_fs_path_isdir(path.ptr));
+
+	git_str_joinpath(&path, path.ptr, "subdir");
+	cl_assert(!git_fs_path_isdir(path.ptr));
+	cl_git_pass(git_futils_mkdir(path.ptr, 0755, 0));
+	cl_assert(git_fs_path_isdir(path.ptr));
+
+	/* ensure mkdir_r works for a single subdir */
+	git_str_joinpath(&path, path.ptr, "another");
+	cl_assert(!git_fs_path_isdir(path.ptr));
+	cl_git_pass(git_futils_mkdir_r(path.ptr, 0755));
+	cl_assert(git_fs_path_isdir(path.ptr));
+
+	/* ensure mkdir_r works */
+	git_str_joinpath(&path, clar_sandbox_path(), "d1/foo/bar/asdf");
+	cl_assert(!git_fs_path_isdir(path.ptr));
+	cl_git_pass(git_futils_mkdir_r(path.ptr, 0755));
+	cl_assert(git_fs_path_isdir(path.ptr));
+
+	/* ensure we don't imply recursive */
+	git_str_joinpath(&path, clar_sandbox_path(), "d2/foo/bar/asdf");
+	cl_assert(!git_fs_path_isdir(path.ptr));
+	cl_git_fail(git_futils_mkdir(path.ptr, 0755, 0));
+	cl_assert(!git_fs_path_isdir(path.ptr));
+
+	git_str_dispose(&path);
+}
+
+void test_core_mkdir__basic(void)
+{
+	cl_set_cleanup(cleanup_basic_dirs, NULL);
+
+	/* make a directory */
+	cl_assert(!git_fs_path_isdir("d0"));
+	cl_git_pass(git_futils_mkdir("d0", 0755, 0));
+	cl_assert(git_fs_path_isdir("d0"));
+
+	/* make a path */
+	cl_assert(!git_fs_path_isdir("d1"));
+	cl_git_pass(git_futils_mkdir("d1/d1.1/d1.2", 0755, GIT_MKDIR_PATH));
+	cl_assert(git_fs_path_isdir("d1"));
+	cl_assert(git_fs_path_isdir("d1/d1.1"));
+	cl_assert(git_fs_path_isdir("d1/d1.1/d1.2"));
+
+	/* make a dir exclusively */
+	cl_assert(!git_fs_path_isdir("d2"));
+	cl_git_pass(git_futils_mkdir("d2", 0755, GIT_MKDIR_EXCL));
+	cl_assert(git_fs_path_isdir("d2"));
+
+	/* make exclusive failure */
+	cl_git_fail(git_futils_mkdir("d2", 0755, GIT_MKDIR_EXCL));
+
+	/* make a path exclusively */
+	cl_assert(!git_fs_path_isdir("d3"));
+	cl_git_pass(git_futils_mkdir("d3/d3.1/d3.2", 0755, GIT_MKDIR_PATH | GIT_MKDIR_EXCL));
+	cl_assert(git_fs_path_isdir("d3"));
+	cl_assert(git_fs_path_isdir("d3/d3.1/d3.2"));
+
+	/* make exclusive path failure */
+	cl_git_fail(git_futils_mkdir("d3/d3.1/d3.2", 0755, GIT_MKDIR_PATH | GIT_MKDIR_EXCL));
+	/* ??? Should EXCL only apply to the last item in the path? */
+
+	/* path with trailing slash? */
+	cl_assert(!git_fs_path_isdir("d4"));
+	cl_git_pass(git_futils_mkdir("d4/d4.1/", 0755, GIT_MKDIR_PATH));
+	cl_assert(git_fs_path_isdir("d4/d4.1"));
+}
+
+static void cleanup_basedir(void *ref)
+{
+	GIT_UNUSED(ref);
+	git_futils_rmdir_r("base", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+}
+
+void test_core_mkdir__with_base(void)
+{
+#define BASEDIR "base/dir/here"
+
+	cl_set_cleanup(cleanup_basedir, NULL);
+
+	cl_git_pass(git_futils_mkdir(BASEDIR, 0755, GIT_MKDIR_PATH));
+
+	cl_git_pass(git_futils_mkdir_relative("a", BASEDIR, 0755, 0, NULL));
+	cl_assert(git_fs_path_isdir(BASEDIR "/a"));
+
+	cl_git_pass(git_futils_mkdir_relative("b/b1/b2", BASEDIR, 0755, GIT_MKDIR_PATH, NULL));
+	cl_assert(git_fs_path_isdir(BASEDIR "/b/b1/b2"));
+
+	/* exclusive with existing base */
+	cl_git_pass(git_futils_mkdir_relative("c/c1/c2", BASEDIR, 0755, GIT_MKDIR_PATH | GIT_MKDIR_EXCL, NULL));
+
+	/* fail: exclusive with duplicated suffix */
+	cl_git_fail(git_futils_mkdir_relative("c/c1/c3", BASEDIR, 0755, GIT_MKDIR_PATH | GIT_MKDIR_EXCL, NULL));
+
+	/* fail: exclusive with any duplicated component */
+	cl_git_fail(git_futils_mkdir_relative("c/cz/cz", BASEDIR, 0755, GIT_MKDIR_PATH | GIT_MKDIR_EXCL, NULL));
+
+	/* success: exclusive without path */
+	cl_git_pass(git_futils_mkdir_relative("c/c1/c3", BASEDIR, 0755, GIT_MKDIR_EXCL, NULL));
+
+	/* path with shorter base and existing dirs */
+	cl_git_pass(git_futils_mkdir_relative("dir/here/d/", "base", 0755, GIT_MKDIR_PATH, NULL));
+	cl_assert(git_fs_path_isdir("base/dir/here/d"));
+
+	/* fail: path with shorter base and existing dirs */
+	cl_git_fail(git_futils_mkdir_relative("dir/here/e/", "base", 0755, GIT_MKDIR_PATH | GIT_MKDIR_EXCL, NULL));
+
+	/* fail: base with missing components */
+	cl_git_fail(git_futils_mkdir_relative("f/", "base/missing", 0755, GIT_MKDIR_PATH, NULL));
+
+	/* success: shift missing component to path */
+	cl_git_pass(git_futils_mkdir_relative("missing/f/", "base/", 0755, GIT_MKDIR_PATH, NULL));
+}
+
+static void cleanup_chmod_root(void *ref)
+{
+	mode_t *mode = ref;
+
+	if (mode != NULL) {
+		(void)p_umask(*mode);
+		git__free(mode);
+	}
+
+	git_futils_rmdir_r("r", NULL, GIT_RMDIR_EMPTY_HIERARCHY);
+}
+
+#define check_mode(X,A) check_mode_at_line((X), (A), __FILE__, __func__, __LINE__)
+
+static void check_mode_at_line(
+	mode_t expected, mode_t actual,
+	const char *file, const char *func, int line)
+{
+	/* FAT filesystems don't support exec bit, nor group/world bits */
+	if (!cl_is_chmod_supported()) {
+		expected &= 0600;
+		actual &= 0600;
+	}
+
+	clar__assert_equal(
+		file, func, line, "expected_mode != actual_mode", 1,
+		"%07o", (int)expected, (int)(actual & 0777));
+}
+
+void test_core_mkdir__chmods(void)
+{
+	struct stat st;
+	mode_t *old = git__malloc(sizeof(mode_t));
+	*old = p_umask(022);
+
+	cl_set_cleanup(cleanup_chmod_root, old);
+
+	cl_git_pass(git_futils_mkdir("r", 0777, 0));
+
+	cl_git_pass(git_futils_mkdir_relative("mode/is/important", "r", 0777, GIT_MKDIR_PATH, NULL));
+
+	cl_git_pass(git_fs_path_lstat("r/mode", &st));
+	check_mode(0755, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode/is", &st));
+	check_mode(0755, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode/is/important", &st));
+	check_mode(0755, st.st_mode);
+
+	cl_git_pass(git_futils_mkdir_relative("mode2/is2/important2", "r", 0777, GIT_MKDIR_PATH | GIT_MKDIR_CHMOD, NULL));
+
+	cl_git_pass(git_fs_path_lstat("r/mode2", &st));
+	check_mode(0755, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode2/is2", &st));
+	check_mode(0755, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode2/is2/important2", &st));
+	check_mode(0777, st.st_mode);
+
+	cl_git_pass(git_futils_mkdir_relative("mode3/is3/important3", "r", 0777, GIT_MKDIR_PATH | GIT_MKDIR_CHMOD_PATH, NULL));
+
+	cl_git_pass(git_fs_path_lstat("r/mode3", &st));
+	check_mode(0777, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode3/is3", &st));
+	check_mode(0777, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode3/is3/important3", &st));
+	check_mode(0777, st.st_mode);
+
+	/* test that we chmod existing dir */
+
+	cl_git_pass(git_futils_mkdir_relative("mode/is/important", "r", 0777, GIT_MKDIR_PATH | GIT_MKDIR_CHMOD, NULL));
+
+	cl_git_pass(git_fs_path_lstat("r/mode", &st));
+	check_mode(0755, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode/is", &st));
+	check_mode(0755, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode/is/important", &st));
+	check_mode(0777, st.st_mode);
+
+	/* test that we chmod even existing dirs if CHMOD_PATH is set */
+
+	cl_git_pass(git_futils_mkdir_relative("mode2/is2/important2.1", "r", 0777, GIT_MKDIR_PATH | GIT_MKDIR_CHMOD_PATH, NULL));
+
+	cl_git_pass(git_fs_path_lstat("r/mode2", &st));
+	check_mode(0777, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode2/is2", &st));
+	check_mode(0777, st.st_mode);
+	cl_git_pass(git_fs_path_lstat("r/mode2/is2/important2.1", &st));
+	check_mode(0777, st.st_mode);
+}
+
+void test_core_mkdir__keeps_parent_symlinks(void)
+{
+#ifndef GIT_WIN32
+	git_str path = GIT_STR_INIT;
+
+	cl_set_cleanup(cleanup_basic_dirs, NULL);
+
+	/* make a directory */
+	cl_assert(!git_fs_path_isdir("d0"));
+	cl_git_pass(git_futils_mkdir("d0", 0755, 0));
+	cl_assert(git_fs_path_isdir("d0"));
+
+	cl_must_pass(symlink("d0", "d1"));
+	cl_assert(git_fs_path_islink("d1"));
+
+	cl_git_pass(git_futils_mkdir("d1/foo/bar", 0755, GIT_MKDIR_PATH|GIT_MKDIR_REMOVE_SYMLINKS));
+	cl_assert(git_fs_path_islink("d1"));
+	cl_assert(git_fs_path_isdir("d1/foo/bar"));
+	cl_assert(git_fs_path_isdir("d0/foo/bar"));
+
+	cl_must_pass(symlink("d0", "d2"));
+	cl_assert(git_fs_path_islink("d2"));
+
+	git_str_joinpath(&path, clar_sandbox_path(), "d2/other/dir");
+
+	cl_git_pass(git_futils_mkdir(path.ptr, 0755, GIT_MKDIR_PATH|GIT_MKDIR_REMOVE_SYMLINKS));
+	cl_assert(git_fs_path_islink("d2"));
+	cl_assert(git_fs_path_isdir("d2/other/dir"));
+	cl_assert(git_fs_path_isdir("d0/other/dir"));
+
+	git_str_dispose(&path);
+#endif
+}
+
+void test_core_mkdir__mkdir_path_inside_unwriteable_parent(void)
+{
+	struct stat st;
+	mode_t *old;
+
+	/* FAT filesystems don't support exec bit, nor group/world bits */
+	if (!cl_is_chmod_supported())
+		return;
+
+	cl_assert((old = git__malloc(sizeof(mode_t))) != NULL);
+	*old = p_umask(022);
+	cl_set_cleanup(cleanup_chmod_root, old);
+
+	cl_git_pass(git_futils_mkdir("r", 0777, 0));
+	cl_git_pass(git_futils_mkdir_relative("mode/is/important", "r", 0777, GIT_MKDIR_PATH, NULL));
+	cl_git_pass(git_fs_path_lstat("r/mode", &st));
+	check_mode(0755, st.st_mode);
+
+	cl_must_pass(p_chmod("r/mode", 0111));
+	cl_git_pass(git_fs_path_lstat("r/mode", &st));
+	check_mode(0111, st.st_mode);
+
+	cl_git_pass(
+		git_futils_mkdir_relative("mode/is/okay/inside", "r", 0777, GIT_MKDIR_PATH, NULL));
+	cl_git_pass(git_fs_path_lstat("r/mode/is/okay/inside", &st));
+	check_mode(0755, st.st_mode);
+
+	cl_must_pass(p_chmod("r/mode", 0777));
+}
diff --git a/tests/libgit2/core/oid.c b/tests/libgit2/core/oid.c
new file mode 100644
index 000000000..894feadf6
--- /dev/null
+++ b/tests/libgit2/core/oid.c
@@ -0,0 +1,79 @@
+#include "clar_libgit2.h"
+#include "oid.h"
+
+static git_oid id;
+static git_oid idp;
+static git_oid idm;
+const char *str_oid = "ae90f12eea699729ed24555e40b9fd669da12a12";
+const char *str_oid_p = "ae90f12eea699729ed";
+const char *str_oid_m = "ae90f12eea699729ed24555e40b9fd669da12a12THIS IS EXTRA TEXT THAT SHOULD GET IGNORED";
+
+void test_core_oid__initialize(void)
+{
+	cl_git_pass(git_oid_fromstr(&id, str_oid));
+	cl_git_pass(git_oid_fromstrp(&idp, str_oid_p));
+	cl_git_fail(git_oid_fromstrp(&idm, str_oid_m));
+}
+
+void test_core_oid__streq(void)
+{
+	cl_assert_equal_i(0, git_oid_streq(&id, str_oid));
+	cl_assert_equal_i(-1, git_oid_streq(&id, "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
+
+	cl_assert_equal_i(-1, git_oid_streq(&id, "deadbeef"));
+	cl_assert_equal_i(-1, git_oid_streq(&id, "I'm not an oid.... :)"));
+
+	cl_assert_equal_i(0, git_oid_streq(&idp, "ae90f12eea699729ed0000000000000000000000"));
+	cl_assert_equal_i(0, git_oid_streq(&idp, "ae90f12eea699729ed"));
+	cl_assert_equal_i(-1, git_oid_streq(&idp, "ae90f12eea699729ed1"));
+	cl_assert_equal_i(-1, git_oid_streq(&idp, "ae90f12eea699729ec"));
+	cl_assert_equal_i(-1, git_oid_streq(&idp, "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
+
+	cl_assert_equal_i(-1, git_oid_streq(&idp, "deadbeef"));
+	cl_assert_equal_i(-1, git_oid_streq(&idp, "I'm not an oid.... :)"));
+}
+
+void test_core_oid__strcmp(void)
+{
+	cl_assert_equal_i(0, git_oid_strcmp(&id, str_oid));
+	cl_assert(git_oid_strcmp(&id, "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef") < 0);
+
+	cl_assert(git_oid_strcmp(&id, "deadbeef") < 0);
+	cl_assert_equal_i(-1, git_oid_strcmp(&id, "I'm not an oid.... :)"));
+
+	cl_assert_equal_i(0, git_oid_strcmp(&idp, "ae90f12eea699729ed0000000000000000000000"));
+	cl_assert_equal_i(0, git_oid_strcmp(&idp, "ae90f12eea699729ed"));
+	cl_assert(git_oid_strcmp(&idp, "ae90f12eea699729ed1") < 0);
+	cl_assert(git_oid_strcmp(&idp, "ae90f12eea699729ec") > 0);
+	cl_assert(git_oid_strcmp(&idp, "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef") < 0);
+
+	cl_assert(git_oid_strcmp(&idp, "deadbeef") < 0);
+	cl_assert_equal_i(-1, git_oid_strcmp(&idp, "I'm not an oid.... :)"));
+}
+
+void test_core_oid__ncmp(void)
+{
+	cl_assert(!git_oid_ncmp(&id, &idp, 0));
+	cl_assert(!git_oid_ncmp(&id, &idp, 1));
+	cl_assert(!git_oid_ncmp(&id, &idp, 2));
+	cl_assert(!git_oid_ncmp(&id, &idp, 17));
+	cl_assert(!git_oid_ncmp(&id, &idp, 18));
+	cl_assert(git_oid_ncmp(&id, &idp, 19));
+	cl_assert(git_oid_ncmp(&id, &idp, 40));
+	cl_assert(git_oid_ncmp(&id, &idp, 41));
+	cl_assert(git_oid_ncmp(&id, &idp, 42));
+
+	cl_assert(!git_oid_ncmp(&id, &id, 0));
+	cl_assert(!git_oid_ncmp(&id, &id, 1));
+	cl_assert(!git_oid_ncmp(&id, &id, 39));
+	cl_assert(!git_oid_ncmp(&id, &id, 40));
+	cl_assert(!git_oid_ncmp(&id, &id, 41));
+}
+
+void test_core_oid__is_hexstr(void)
+{
+	cl_assert(git_oid__is_hexstr("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
+	cl_assert(!git_oid__is_hexstr("deadbeefdeadbeef"));
+	cl_assert(!git_oid__is_hexstr("zeadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
+	cl_assert(!git_oid__is_hexstr("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef1"));
+}
diff --git a/tests/libgit2/core/oidmap.c b/tests/libgit2/core/oidmap.c
new file mode 100644
index 000000000..7f98287a6
--- /dev/null
+++ b/tests/libgit2/core/oidmap.c
@@ -0,0 +1,127 @@
+#include "clar_libgit2.h"
+#include "oidmap.h"
+
+static struct {
+	git_oid oid;
+	size_t extra;
+} test_oids[0x0FFF];
+
+static git_oidmap *g_map;
+
+void test_core_oidmap__initialize(void)
+{
+	uint32_t i, j;
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i) {
+		uint32_t segment = i / 8;
+		int modi = i - (segment * 8);
+
+		test_oids[i].extra = i;
+
+		for (j = 0; j < GIT_OID_RAWSZ / 4; ++j) {
+			test_oids[i].oid.id[j * 4    ] = (unsigned char)modi;
+			test_oids[i].oid.id[j * 4 + 1] = (unsigned char)(modi >> 8);
+			test_oids[i].oid.id[j * 4 + 2] = (unsigned char)(modi >> 16);
+			test_oids[i].oid.id[j * 4 + 3] = (unsigned char)(modi >> 24);
+		}
+
+		test_oids[i].oid.id[ 8] = (unsigned char)i;
+		test_oids[i].oid.id[ 9] = (unsigned char)(i >> 8);
+		test_oids[i].oid.id[10] = (unsigned char)(i >> 16);
+		test_oids[i].oid.id[11] = (unsigned char)(i >> 24);
+	}
+
+	cl_git_pass(git_oidmap_new(&g_map));
+}
+
+void test_core_oidmap__cleanup(void)
+{
+	git_oidmap_free(g_map);
+}
+
+void test_core_oidmap__basic(void)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i) {
+		cl_assert(!git_oidmap_exists(g_map, &test_oids[i].oid));
+		cl_git_pass(git_oidmap_set(g_map, &test_oids[i].oid, &test_oids[i]));
+	}
+
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i) {
+		cl_assert(git_oidmap_exists(g_map, &test_oids[i].oid));
+		cl_assert_equal_p(git_oidmap_get(g_map, &test_oids[i].oid), &test_oids[i]);
+	}
+}
+
+void test_core_oidmap__hash_collision(void)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i) {
+		cl_assert(!git_oidmap_exists(g_map, &test_oids[i].oid));
+		cl_git_pass(git_oidmap_set(g_map, &test_oids[i].oid, &test_oids[i]));
+	}
+
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i) {
+		cl_assert(git_oidmap_exists(g_map, &test_oids[i].oid));
+		cl_assert_equal_p(git_oidmap_get(g_map, &test_oids[i].oid), &test_oids[i]);
+	}
+}
+
+void test_core_oidmap__get_succeeds_with_existing_keys(void)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i)
+		cl_git_pass(git_oidmap_set(g_map, &test_oids[i].oid, &test_oids[i]));
+
+	for (i = 0; i < ARRAY_SIZE(test_oids); ++i)
+		cl_assert_equal_p(git_oidmap_get(g_map, &test_oids[i].oid), &test_oids[i]);
+}
+
+void test_core_oidmap__get_fails_with_nonexisting_key(void)
+{
+	size_t i;
+
+	/* Do _not_ add last OID to verify that we cannot look it up */
+	for (i = 0; i < ARRAY_SIZE(test_oids) - 1; ++i)
+		cl_git_pass(git_oidmap_set(g_map, &test_oids[i].oid, &test_oids[i]));
+
+	cl_assert_equal_p(git_oidmap_get(g_map, &test_oids[ARRAY_SIZE(test_oids) - 1].oid), NULL);
+}
+
+void test_core_oidmap__setting_oid_persists(void)
+{
+	git_oid oids[] = {
+	    {{ 0x01 }},
+	    {{ 0x02 }},
+	    {{ 0x03 }}
+	};
+
+	cl_git_pass(git_oidmap_set(g_map, &oids[0], "one"));
+	cl_git_pass(git_oidmap_set(g_map, &oids[1], "two"));
+	cl_git_pass(git_oidmap_set(g_map, &oids[2], "three"));
+
+	cl_assert_equal_s(git_oidmap_get(g_map, &oids[0]), "one");
+	cl_assert_equal_s(git_oidmap_get(g_map, &oids[1]), "two");
+	cl_assert_equal_s(git_oidmap_get(g_map, &oids[2]), "three");
+}
+
+void test_core_oidmap__setting_existing_key_updates(void)
+{
+	git_oid oids[] = {
+	    {{ 0x01 }},
+	    {{ 0x02 }},
+	    {{ 0x03 }}
+	};
+
+	cl_git_pass(git_oidmap_set(g_map, &oids[0], "one"));
+	cl_git_pass(git_oidmap_set(g_map, &oids[1], "two"));
+	cl_git_pass(git_oidmap_set(g_map, &oids[2], "three"));
+	cl_assert_equal_i(git_oidmap_size(g_map), 3);
+
+	cl_git_pass(git_oidmap_set(g_map, &oids[1], "other"));
+	cl_assert_equal_i(git_oidmap_size(g_map), 3);
+
+	cl_assert_equal_s(git_oidmap_get(g_map, &oids[1]), "other");
+}
diff --git a/tests/libgit2/core/opts.c b/tests/libgit2/core/opts.c
new file mode 100644
index 000000000..e8f65d510
--- /dev/null
+++ b/tests/libgit2/core/opts.c
@@ -0,0 +1,71 @@
+#include "clar_libgit2.h"
+#include "cache.h"
+
+void test_core_opts__cleanup(void)
+{
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, NULL, 0));
+}
+
+void test_core_opts__readwrite(void)
+{
+	size_t old_val = 0;
+	size_t new_val = 0;
+
+	git_libgit2_opts(GIT_OPT_GET_MWINDOW_SIZE, &old_val);
+	git_libgit2_opts(GIT_OPT_SET_MWINDOW_SIZE, (size_t)1234);
+	git_libgit2_opts(GIT_OPT_GET_MWINDOW_SIZE, &new_val);
+
+	cl_assert(new_val == 1234);
+
+	git_libgit2_opts(GIT_OPT_SET_MWINDOW_SIZE, old_val);
+	git_libgit2_opts(GIT_OPT_GET_MWINDOW_SIZE, &new_val);
+
+	cl_assert(new_val == old_val);
+}
+
+void test_core_opts__invalid_option(void)
+{
+	cl_git_fail(git_libgit2_opts(-1, "foobar"));
+}
+
+void test_core_opts__extensions_query(void)
+{
+	git_strarray out = { 0 };
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, &out));
+
+	cl_assert_equal_sz(out.count, 1);
+	cl_assert_equal_s("noop", out.strings[0]);
+
+	git_strarray_dispose(&out);
+}
+
+void test_core_opts__extensions_add(void)
+{
+	const char *in[] = { "foo" };
+	git_strarray out = { 0 };
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, in, ARRAY_SIZE(in)));
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, &out));
+
+	cl_assert_equal_sz(out.count, 2);
+	cl_assert_equal_s("noop", out.strings[0]);
+	cl_assert_equal_s("foo", out.strings[1]);
+
+	git_strarray_dispose(&out);
+}
+
+void test_core_opts__extensions_remove(void)
+{
+	const char *in[] = { "bar", "!negate", "!noop", "baz" };
+	git_strarray out = { 0 };
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_EXTENSIONS, in, ARRAY_SIZE(in)));
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_EXTENSIONS, &out));
+
+	cl_assert_equal_sz(out.count, 2);
+	cl_assert_equal_s("bar", out.strings[0]);
+	cl_assert_equal_s("baz", out.strings[1]);
+
+	git_strarray_dispose(&out);
+}
diff --git a/tests/libgit2/core/path.c b/tests/libgit2/core/path.c
new file mode 100644
index 000000000..a0ae77f1c
--- /dev/null
+++ b/tests/libgit2/core/path.c
@@ -0,0 +1,739 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+#include "fs_path.h"
+
+static char *path_save;
+
+void test_core_path__initialize(void)
+{
+	path_save = cl_getenv("PATH");
+}
+
+void test_core_path__cleanup(void)
+{
+	cl_setenv("PATH", path_save);
+	git__free(path_save);
+	path_save = NULL;
+}
+
+static void
+check_dirname(const char *A, const char *B)
+{
+	git_str dir = GIT_STR_INIT;
+	char *dir2;
+
+	cl_assert(git_fs_path_dirname_r(&dir, A) >= 0);
+	cl_assert_equal_s(B, dir.ptr);
+	git_str_dispose(&dir);
+
+	cl_assert((dir2 = git_fs_path_dirname(A)) != NULL);
+	cl_assert_equal_s(B, dir2);
+	git__free(dir2);
+}
+
+static void
+check_basename(const char *A, const char *B)
+{
+	git_str base = GIT_STR_INIT;
+	char *base2;
+
+	cl_assert(git_fs_path_basename_r(&base, A) >= 0);
+	cl_assert_equal_s(B, base.ptr);
+	git_str_dispose(&base);
+
+	cl_assert((base2 = git_fs_path_basename(A)) != NULL);
+	cl_assert_equal_s(B, base2);
+	git__free(base2);
+}
+
+static void
+check_joinpath(const char *path_a, const char *path_b, const char *expected_path)
+{
+	git_str joined_path = GIT_STR_INIT;
+
+	cl_git_pass(git_str_joinpath(&joined_path, path_a, path_b));
+	cl_assert_equal_s(expected_path, joined_path.ptr);
+
+	git_str_dispose(&joined_path);
+}
+
+static void
+check_joinpath_n(
+	const char *path_a,
+	const char *path_b,
+	const char *path_c,
+	const char *path_d,
+	const char *expected_path)
+{
+	git_str joined_path = GIT_STR_INIT;
+
+	cl_git_pass(git_str_join_n(&joined_path, '/', 4,
+							   path_a, path_b, path_c, path_d));
+	cl_assert_equal_s(expected_path, joined_path.ptr);
+
+	git_str_dispose(&joined_path);
+}
+
+static void check_setenv(const char* name, const char* value)
+{
+    char* check;
+
+    cl_git_pass(cl_setenv(name, value));
+    check = cl_getenv(name);
+
+    if (value)
+	cl_assert_equal_s(value, check);
+    else
+	cl_assert(check == NULL);
+
+    git__free(check);
+}
+
+/* get the dirname of a path */
+void test_core_path__00_dirname(void)
+{
+	check_dirname(NULL, ".");
+	check_dirname("", ".");
+	check_dirname("a", ".");
+	check_dirname("/", "/");
+	check_dirname("/usr", "/");
+	check_dirname("/usr/", "/");
+	check_dirname("/usr/lib", "/usr");
+	check_dirname("/usr/lib/", "/usr");
+	check_dirname("/usr/lib//", "/usr");
+	check_dirname("usr/lib", "usr");
+	check_dirname("usr/lib/", "usr");
+	check_dirname("usr/lib//", "usr");
+	check_dirname(".git/", ".");
+
+	check_dirname(REP16("/abc"), REP15("/abc"));
+
+#ifdef GIT_WIN32
+	check_dirname("C:/", "C:/");
+	check_dirname("C:", "C:/");
+	check_dirname("C:/path/", "C:/");
+	check_dirname("C:/path", "C:/");
+	check_dirname("//computername/", "//computername/");
+	check_dirname("//computername", "//computername/");
+	check_dirname("//computername/path/", "//computername/");
+	check_dirname("//computername/path", "//computername/");
+	check_dirname("//computername/sub/path/", "//computername/sub");
+	check_dirname("//computername/sub/path", "//computername/sub");
+#endif
+}
+
+/* get the base name of a path */
+void test_core_path__01_basename(void)
+{
+	check_basename(NULL, ".");
+	check_basename("", ".");
+	check_basename("a", "a");
+	check_basename("/", "/");
+	check_basename("/usr", "usr");
+	check_basename("/usr/", "usr");
+	check_basename("/usr/lib", "lib");
+	check_basename("/usr/lib//", "lib");
+	check_basename("usr/lib", "lib");
+
+	check_basename(REP16("/abc"), "abc");
+	check_basename(REP1024("/abc"), "abc");
+}
+
+/* properly join path components */
+void test_core_path__05_joins(void)
+{
+	check_joinpath("", "", "");
+	check_joinpath("", "a", "a");
+	check_joinpath("", "/a", "/a");
+	check_joinpath("a", "", "a/");
+	check_joinpath("a", "/", "a/");
+	check_joinpath("a", "b", "a/b");
+	check_joinpath("/", "a", "/a");
+	check_joinpath("/", "", "/");
+	check_joinpath("/a", "/b", "/a/b");
+	check_joinpath("/a", "/b/", "/a/b/");
+	check_joinpath("/a/", "b/", "/a/b/");
+	check_joinpath("/a/", "/b/", "/a/b/");
+
+	check_joinpath("/abcd", "/defg", "/abcd/defg");
+	check_joinpath("/abcd", "/defg/", "/abcd/defg/");
+	check_joinpath("/abcd/", "defg/", "/abcd/defg/");
+	check_joinpath("/abcd/", "/defg/", "/abcd/defg/");
+
+	check_joinpath("/abcdefgh", "/12345678", "/abcdefgh/12345678");
+	check_joinpath("/abcdefgh", "/12345678/", "/abcdefgh/12345678/");
+	check_joinpath("/abcdefgh/", "12345678/", "/abcdefgh/12345678/");
+
+	check_joinpath(REP1024("aaaa"), "", REP1024("aaaa") "/");
+	check_joinpath(REP1024("aaaa/"), "", REP1024("aaaa/"));
+	check_joinpath(REP1024("/aaaa"), "", REP1024("/aaaa") "/");
+
+	check_joinpath(REP1024("aaaa"), REP1024("bbbb"),
+				   REP1024("aaaa") "/" REP1024("bbbb"));
+	check_joinpath(REP1024("/aaaa"), REP1024("/bbbb"),
+				   REP1024("/aaaa") REP1024("/bbbb"));
+}
+
+/* properly join path components for more than one path */
+void test_core_path__06_long_joins(void)
+{
+	check_joinpath_n("", "", "", "", "");
+	check_joinpath_n("", "a", "", "", "a/");
+	check_joinpath_n("a", "", "", "", "a/");
+	check_joinpath_n("", "", "", "a", "a");
+	check_joinpath_n("a", "b", "", "/c/d/", "a/b/c/d/");
+	check_joinpath_n("a", "b", "", "/c/d", "a/b/c/d");
+	check_joinpath_n("abcd", "efgh", "ijkl", "mnop", "abcd/efgh/ijkl/mnop");
+	check_joinpath_n("abcd/", "efgh/", "ijkl/", "mnop/", "abcd/efgh/ijkl/mnop/");
+	check_joinpath_n("/abcd/", "/efgh/", "/ijkl/", "/mnop/", "/abcd/efgh/ijkl/mnop/");
+
+	check_joinpath_n(REP1024("a"), REP1024("b"), REP1024("c"), REP1024("d"),
+					 REP1024("a") "/" REP1024("b") "/"
+					 REP1024("c") "/" REP1024("d"));
+	check_joinpath_n(REP1024("/a"), REP1024("/b"), REP1024("/c"), REP1024("/d"),
+					 REP1024("/a") REP1024("/b")
+					 REP1024("/c") REP1024("/d"));
+}
+
+
+static void
+check_path_to_dir(
+	const char* path,
+    const char* expected)
+{
+	git_str tgt = GIT_STR_INIT;
+
+	git_str_sets(&tgt, path);
+	cl_git_pass(git_fs_path_to_dir(&tgt));
+	cl_assert_equal_s(expected, tgt.ptr);
+
+	git_str_dispose(&tgt);
+}
+
+static void
+check_string_to_dir(
+	const char* path,
+	size_t      maxlen,
+    const char* expected)
+{
+	size_t len = strlen(path);
+	char *buf = git__malloc(len + 2);
+	cl_assert(buf);
+
+	strncpy(buf, path, len + 2);
+
+	git_fs_path_string_to_dir(buf, maxlen);
+
+	cl_assert_equal_s(expected, buf);
+
+	git__free(buf);
+}
+
+/* convert paths to dirs */
+void test_core_path__07_path_to_dir(void)
+{
+	check_path_to_dir("", "");
+	check_path_to_dir(".", "./");
+	check_path_to_dir("./", "./");
+	check_path_to_dir("a/", "a/");
+	check_path_to_dir("ab", "ab/");
+	/* make sure we try just under and just over an expansion that will
+	 * require a realloc
+	 */
+	check_path_to_dir("abcdef", "abcdef/");
+	check_path_to_dir("abcdefg", "abcdefg/");
+	check_path_to_dir("abcdefgh", "abcdefgh/");
+	check_path_to_dir("abcdefghi", "abcdefghi/");
+	check_path_to_dir(REP1024("abcd") "/", REP1024("abcd") "/");
+	check_path_to_dir(REP1024("abcd"), REP1024("abcd") "/");
+
+	check_string_to_dir("", 1, "");
+	check_string_to_dir(".", 1, ".");
+	check_string_to_dir(".", 2, "./");
+	check_string_to_dir(".", 3, "./");
+	check_string_to_dir("abcd", 3, "abcd");
+	check_string_to_dir("abcd", 4, "abcd");
+	check_string_to_dir("abcd", 5, "abcd/");
+	check_string_to_dir("abcd", 6, "abcd/");
+}
+
+/* join path to itself */
+void test_core_path__08_self_join(void)
+{
+	git_str path = GIT_STR_INIT;
+	size_t asize = 0;
+
+	asize = path.asize;
+	cl_git_pass(git_str_sets(&path, "/foo"));
+	cl_assert_equal_s(path.ptr, "/foo");
+	cl_assert(asize < path.asize);
+
+	asize = path.asize;
+	cl_git_pass(git_str_joinpath(&path, path.ptr, "this is a new string"));
+	cl_assert_equal_s(path.ptr, "/foo/this is a new string");
+	cl_assert(asize < path.asize);
+
+	asize = path.asize;
+	cl_git_pass(git_str_joinpath(&path, path.ptr, "/grow the buffer, grow the buffer, grow the buffer"));
+	cl_assert_equal_s(path.ptr, "/foo/this is a new string/grow the buffer, grow the buffer, grow the buffer");
+	cl_assert(asize < path.asize);
+
+	git_str_dispose(&path);
+	cl_git_pass(git_str_sets(&path, "/foo/bar"));
+
+	cl_git_pass(git_str_joinpath(&path, path.ptr + 4, "baz"));
+	cl_assert_equal_s(path.ptr, "/bar/baz");
+
+	asize = path.asize;
+	cl_git_pass(git_str_joinpath(&path, path.ptr + 4, "somethinglongenoughtorealloc"));
+	cl_assert_equal_s(path.ptr, "/baz/somethinglongenoughtorealloc");
+	cl_assert(asize < path.asize);
+
+	git_str_dispose(&path);
+}
+
+static void check_percent_decoding(const char *expected_result, const char *input)
+{
+	git_str buf = GIT_STR_INIT;
+
+	cl_git_pass(git__percent_decode(&buf, input));
+	cl_assert_equal_s(expected_result, git_str_cstr(&buf));
+
+	git_str_dispose(&buf);
+}
+
+void test_core_path__09_percent_decode(void)
+{
+	check_percent_decoding("abcd", "abcd");
+	check_percent_decoding("a2%", "a2%");
+	check_percent_decoding("a2%3", "a2%3");
+	check_percent_decoding("a2%%3", "a2%%3");
+	check_percent_decoding("a2%3z", "a2%3z");
+	check_percent_decoding("a,", "a%2c");
+	check_percent_decoding("a21", "a2%31");
+	check_percent_decoding("a2%1", "a2%%31");
+	check_percent_decoding("a bc ", "a%20bc%20");
+	check_percent_decoding("Vicent Mart" "\355", "Vicent%20Mart%ED");
+}
+
+static void check_fromurl(const char *expected_result, const char *input, int should_fail)
+{
+	git_str buf = GIT_STR_INIT;
+
+	assert(should_fail || expected_result);
+
+	if (!should_fail) {
+		cl_git_pass(git_fs_path_fromurl(&buf, input));
+		cl_assert_equal_s(expected_result, git_str_cstr(&buf));
+	} else
+		cl_git_fail(git_fs_path_fromurl(&buf, input));
+
+	git_str_dispose(&buf);
+}
+
+#ifdef GIT_WIN32
+#define ABS_PATH_MARKER ""
+#else
+#define ABS_PATH_MARKER "/"
+#endif
+
+void test_core_path__10_fromurl(void)
+{
+	/* Failing cases */
+	check_fromurl(NULL, "a", 1);
+	check_fromurl(NULL, "http:///c:/Temp%20folder/note.txt", 1);
+	check_fromurl(NULL, "file://c:/Temp%20folder/note.txt", 1);
+	check_fromurl(NULL, "file:////c:/Temp%20folder/note.txt", 1);
+	check_fromurl(NULL, "file:///", 1);
+	check_fromurl(NULL, "file:////", 1);
+	check_fromurl(NULL, "file://servername/c:/Temp%20folder/note.txt", 1);
+
+	/* Passing cases */
+	check_fromurl(ABS_PATH_MARKER "c:/Temp folder/note.txt", "file:///c:/Temp%20folder/note.txt", 0);
+	check_fromurl(ABS_PATH_MARKER "c:/Temp folder/note.txt", "file://localhost/c:/Temp%20folder/note.txt", 0);
+	check_fromurl(ABS_PATH_MARKER "c:/Temp+folder/note.txt", "file:///c:/Temp+folder/note.txt", 0);
+	check_fromurl(ABS_PATH_MARKER "a", "file:///a", 0);
+}
+
+typedef struct {
+	int expect_idx;
+	int cancel_after;
+	char **expect;
+} check_walkup_info;
+
+#define CANCEL_VALUE 1234
+
+static int check_one_walkup_step(void *ref, const char *path)
+{
+	check_walkup_info *info = (check_walkup_info *)ref;
+
+	if (!info->cancel_after) {
+		cl_assert_equal_s(info->expect[info->expect_idx], "[CANCEL]");
+		return CANCEL_VALUE;
+	}
+	info->cancel_after--;
+
+	cl_assert(info->expect[info->expect_idx] != NULL);
+	cl_assert_equal_s(info->expect[info->expect_idx], path);
+	info->expect_idx++;
+
+	return 0;
+}
+
+void test_core_path__11_walkup(void)
+{
+	git_str p = GIT_STR_INIT;
+
+	char *expect[] = {
+		/*  1 */ "/a/b/c/d/e/", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		/*  2 */ "/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		/*  3 */ "/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		/*  4 */ "/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", "/a/", "/", NULL,
+		/*  5 */ "/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", NULL,
+		/*  6 */ "/a/b/c/d/e", "/a/b/c/d/", "/a/b/c/", "/a/b/", NULL,
+		/*  7 */ "this_is_a_path", "", NULL,
+		/*  8 */ "this_is_a_path/", "", NULL,
+		/*  9 */ "///a///b///c///d///e///", "///a///b///c///d///", "///a///b///c///", "///a///b///", "///a///", "///", NULL,
+		/* 10 */ "a/b/c/", "a/b/", "a/", "", NULL,
+		/* 11 */ "a/b/c", "a/b/", "a/", "", NULL,
+		/* 12 */ "a/b/c/", "a/b/", "a/", NULL,
+		/* 13 */ "", NULL,
+		/* 14 */ "/", NULL,
+		/* 15 */ NULL
+	};
+
+	char *root[] = {
+		/*  1 */ NULL,
+		/*  2 */ NULL,
+		/*  3 */ "/",
+		/*  4 */ "",
+		/*  5 */ "/a/b",
+		/*  6 */ "/a/b/",
+		/*  7 */ NULL,
+		/*  8 */ NULL,
+		/*  9 */ NULL,
+		/* 10 */ NULL,
+		/* 11 */ NULL,
+		/* 12 */ "a/",
+		/* 13 */ NULL,
+		/* 14 */ NULL,
+	};
+
+	int i, j;
+	check_walkup_info info;
+
+	info.expect = expect;
+	info.cancel_after = -1;
+
+	for (i = 0, j = 0; expect[i] != NULL; i++, j++) {
+
+		git_str_sets(&p, expect[i]);
+
+		info.expect_idx = i;
+		cl_git_pass(
+			git_fs_path_walk_up(&p, root[j], check_one_walkup_step, &info)
+		);
+
+		cl_assert_equal_s(p.ptr, expect[i]);
+		cl_assert(expect[info.expect_idx] == NULL);
+		i = info.expect_idx;
+	}
+
+	git_str_dispose(&p);
+}
+
+void test_core_path__11a_walkup_cancel(void)
+{
+	git_str p = GIT_STR_INIT;
+	int cancel[] = { 3, 2, 1, 0 };
+	char *expect[] = {
+		"/a/b/c/d/e/", "/a/b/c/d/", "/a/b/c/", "[CANCEL]", NULL,
+		"/a/b/c/d/e", "/a/b/c/d/", "[CANCEL]", NULL,
+		"/a/b/c/d/e", "[CANCEL]", NULL,
+		"[CANCEL]", NULL,
+		NULL
+	};
+	char *root[] = { NULL, NULL, "/", "", NULL };
+	int i, j;
+	check_walkup_info info;
+
+	info.expect = expect;
+
+	for (i = 0, j = 0; expect[i] != NULL; i++, j++) {
+
+		git_str_sets(&p, expect[i]);
+
+		info.cancel_after = cancel[j];
+		info.expect_idx = i;
+
+		cl_assert_equal_i(
+			CANCEL_VALUE,
+			git_fs_path_walk_up(&p, root[j], check_one_walkup_step, &info)
+		);
+
+		/* skip to next run of expectations */
+		while (expect[i] != NULL) i++;
+	}
+
+	git_str_dispose(&p);
+}
+
+void test_core_path__12_offset_to_path_root(void)
+{
+	cl_assert(git_fs_path_root("non/rooted/path") == -1);
+	cl_assert(git_fs_path_root("/rooted/path") == 0);
+
+#ifdef GIT_WIN32
+	/* Windows specific tests */
+	cl_assert(git_fs_path_root("C:non/rooted/path") == -1);
+	cl_assert(git_fs_path_root("C:/rooted/path") == 2);
+	cl_assert(git_fs_path_root("//computername/sharefolder/resource") == 14);
+	cl_assert(git_fs_path_root("//computername/sharefolder") == 14);
+	cl_assert(git_fs_path_root("//computername") == -1);
+#endif
+}
+
+#define NON_EXISTING_FILEPATH "i_hope_i_do_not_exist"
+
+void test_core_path__13_cannot_prettify_a_non_existing_file(void)
+{
+	git_str p = GIT_STR_INIT;
+
+	cl_assert_equal_b(git_fs_path_exists(NON_EXISTING_FILEPATH), false);
+	cl_assert_equal_i(GIT_ENOTFOUND, git_fs_path_prettify(&p, NON_EXISTING_FILEPATH, NULL));
+	cl_assert_equal_i(GIT_ENOTFOUND, git_fs_path_prettify(&p, NON_EXISTING_FILEPATH "/so-do-i", NULL));
+
+	git_str_dispose(&p);
+}
+
+void test_core_path__14_apply_relative(void)
+{
+	git_str p = GIT_STR_INIT;
+
+	cl_git_pass(git_str_sets(&p, "/this/is/a/base"));
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../test"));
+	cl_assert_equal_s("/this/is/a/test", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../../the/./end"));
+	cl_assert_equal_s("/this/is/the/end", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "./of/this/../the/string"));
+	cl_assert_equal_s("/this/is/the/end/of/the/string", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../../../../../.."));
+	cl_assert_equal_s("/this/", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../"));
+	cl_assert_equal_s("/", p.ptr);
+
+	cl_git_fail(git_fs_path_apply_relative(&p, "../../.."));
+
+
+	cl_git_pass(git_str_sets(&p, "d:/another/test"));
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../.."));
+	cl_assert_equal_s("d:/", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "from/here/to/../and/./back/."));
+	cl_assert_equal_s("d:/from/here/and/back/", p.ptr);
+
+
+	cl_git_pass(git_str_sets(&p, "https://my.url.com/test.git"));
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../another.git"));
+	cl_assert_equal_s("https://my.url.com/another.git", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../full/path/url.patch"));
+	cl_assert_equal_s("https://my.url.com/full/path/url.patch", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, ".."));
+	cl_assert_equal_s("https://my.url.com/full/path/", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../../../"));
+	cl_assert_equal_s("https://", p.ptr);
+
+
+	cl_git_pass(git_str_sets(&p, "../../this/is/relative"));
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../../preserves/the/prefix"));
+	cl_assert_equal_s("../../this/preserves/the/prefix", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../../../../that"));
+	cl_assert_equal_s("../../that", p.ptr);
+
+	cl_git_pass(git_fs_path_apply_relative(&p, "../there"));
+	cl_assert_equal_s("../../there", p.ptr);
+	git_str_dispose(&p);
+}
+
+static void assert_resolve_relative(
+	git_str *buf, const char *expected, const char *path)
+{
+	cl_git_pass(git_str_sets(buf, path));
+	cl_git_pass(git_fs_path_resolve_relative(buf, 0));
+	cl_assert_equal_s(expected, buf->ptr);
+}
+
+void test_core_path__15_resolve_relative(void)
+{
+	git_str buf = GIT_STR_INIT;
+
+	assert_resolve_relative(&buf, "", "");
+	assert_resolve_relative(&buf, "", ".");
+	assert_resolve_relative(&buf, "", "./");
+	assert_resolve_relative(&buf, "..", "..");
+	assert_resolve_relative(&buf, "../", "../");
+	assert_resolve_relative(&buf, "..", "./..");
+	assert_resolve_relative(&buf, "../", "./../");
+	assert_resolve_relative(&buf, "../", "../.");
+	assert_resolve_relative(&buf, "../", ".././");
+	assert_resolve_relative(&buf, "../..", "../..");
+	assert_resolve_relative(&buf, "../../", "../../");
+
+	assert_resolve_relative(&buf, "/", "/");
+	assert_resolve_relative(&buf, "/", "/.");
+
+	assert_resolve_relative(&buf, "", "a/..");
+	assert_resolve_relative(&buf, "", "a/../");
+	assert_resolve_relative(&buf, "", "a/../.");
+
+	assert_resolve_relative(&buf, "/a", "/a");
+	assert_resolve_relative(&buf, "/a/", "/a/.");
+	assert_resolve_relative(&buf, "/", "/a/../");
+	assert_resolve_relative(&buf, "/", "/a/../.");
+	assert_resolve_relative(&buf, "/", "/a/.././");
+
+	assert_resolve_relative(&buf, "a", "a");
+	assert_resolve_relative(&buf, "a/", "a/");
+	assert_resolve_relative(&buf, "a/", "a/.");
+	assert_resolve_relative(&buf, "a/", "a/./");
+
+	assert_resolve_relative(&buf, "a/b", "a//b");
+	assert_resolve_relative(&buf, "a/b/c", "a/b/c");
+	assert_resolve_relative(&buf, "b/c", "./b/c");
+	assert_resolve_relative(&buf, "a/c", "a/./c");
+	assert_resolve_relative(&buf, "a/b/", "a/b/.");
+
+	assert_resolve_relative(&buf, "/a/b/c", "///a/b/c");
+	assert_resolve_relative(&buf, "/", "////");
+	assert_resolve_relative(&buf, "/a", "///a");
+	assert_resolve_relative(&buf, "/", "///.");
+	assert_resolve_relative(&buf, "/", "///a/..");
+
+	assert_resolve_relative(&buf, "../../path", "../../test//../././path");
+	assert_resolve_relative(&buf, "../d", "a/b/../../../c/../d");
+
+	cl_git_pass(git_str_sets(&buf, "/.."));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+
+	cl_git_pass(git_str_sets(&buf, "/./.."));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+
+	cl_git_pass(git_str_sets(&buf, "/.//.."));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+
+	cl_git_pass(git_str_sets(&buf, "/../."));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+
+	cl_git_pass(git_str_sets(&buf, "/../.././../a"));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+
+	cl_git_pass(git_str_sets(&buf, "////.."));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+
+	/* things that start with Windows network paths */
+#ifdef GIT_WIN32
+	assert_resolve_relative(&buf, "//a/b/c", "//a/b/c");
+	assert_resolve_relative(&buf, "//a/", "//a/b/..");
+	assert_resolve_relative(&buf, "//a/b/c", "//a/Q/../b/x/y/../../c");
+
+	cl_git_pass(git_str_sets(&buf, "//a/b/../.."));
+	cl_git_fail(git_fs_path_resolve_relative(&buf, 0));
+#else
+	assert_resolve_relative(&buf, "/a/b/c", "//a/b/c");
+	assert_resolve_relative(&buf, "/a/", "//a/b/..");
+	assert_resolve_relative(&buf, "/a/b/c", "//a/Q/../b/x/y/../../c");
+	assert_resolve_relative(&buf, "/", "//a/b/../..");
+#endif
+
+	git_str_dispose(&buf);
+}
+
+#define assert_common_dirlen(i, p, q) \
+	cl_assert_equal_i((i), git_fs_path_common_dirlen((p), (q)));
+
+void test_core_path__16_resolve_relative(void)
+{
+	assert_common_dirlen(0, "", "");
+	assert_common_dirlen(0, "", "bar.txt");
+	assert_common_dirlen(0, "foo.txt", "bar.txt");
+	assert_common_dirlen(0, "foo.txt", "");
+	assert_common_dirlen(0, "foo/bar.txt", "bar/foo.txt");
+	assert_common_dirlen(0, "foo/bar.txt", "../foo.txt");
+
+	assert_common_dirlen(1, "/one.txt", "/two.txt");
+	assert_common_dirlen(4, "foo/one.txt", "foo/two.txt");
+	assert_common_dirlen(5, "/foo/one.txt", "/foo/two.txt");
+
+	assert_common_dirlen(6, "a/b/c/foo.txt", "a/b/c/d/e/bar.txt");
+	assert_common_dirlen(7, "/a/b/c/foo.txt", "/a/b/c/d/e/bar.txt");
+}
+
+static void fix_path(git_str *s)
+{
+#ifndef GIT_WIN32
+	GIT_UNUSED(s);
+#else
+	char* c;
+
+	for (c = s->ptr; *c; c++) {
+		if (*c == '/')
+			*c = '\\';
+	}
+#endif
+}
+
+void test_core_path__find_exe_in_path(void)
+{
+	char *orig_path;
+	git_str sandbox_path = GIT_STR_INIT;
+	git_str new_path = GIT_STR_INIT, full_path = GIT_STR_INIT,
+	        dummy_path = GIT_STR_INIT;
+
+#ifdef GIT_WIN32
+	static const char *bogus_path_1 = "c:\\does\\not\\exist\\";
+	static const char *bogus_path_2 = "e:\\non\\existent";
+#else
+	static const char *bogus_path_1 = "/this/path/does/not/exist/";
+	static const char *bogus_path_2 = "/non/existent";
+#endif
+
+	orig_path = cl_getenv("PATH");
+
+	git_str_puts(&sandbox_path, clar_sandbox_path());
+	git_str_joinpath(&dummy_path, sandbox_path.ptr, "dummmmmmmy_libgit2_file");
+	cl_git_rewritefile(dummy_path.ptr, "this is a dummy file");
+
+	fix_path(&sandbox_path);
+	fix_path(&dummy_path);
+
+	cl_git_pass(git_str_printf(&new_path, "%s%c%s%c%s%c%s",
+		bogus_path_1, GIT_PATH_LIST_SEPARATOR,
+		orig_path, GIT_PATH_LIST_SEPARATOR,
+		sandbox_path.ptr, GIT_PATH_LIST_SEPARATOR,
+		bogus_path_2));
+
+	check_setenv("PATH", new_path.ptr);
+
+	cl_git_fail_with(GIT_ENOTFOUND, git_fs_path_find_executable(&full_path, "this_file_does_not_exist"));
+	cl_git_pass(git_fs_path_find_executable(&full_path, "dummmmmmmy_libgit2_file"));
+
+	cl_assert_equal_s(full_path.ptr, dummy_path.ptr);
+
+	git_str_dispose(&full_path);
+	git_str_dispose(&new_path);
+	git_str_dispose(&dummy_path);
+	git_str_dispose(&sandbox_path);
+	git__free(orig_path);
+}
diff --git a/tests/libgit2/core/pool.c b/tests/libgit2/core/pool.c
new file mode 100644
index 000000000..b07da0abd
--- /dev/null
+++ b/tests/libgit2/core/pool.c
@@ -0,0 +1,92 @@
+#include "clar_libgit2.h"
+#include "pool.h"
+#include "git2/oid.h"
+
+void test_core_pool__0(void)
+{
+	int i;
+	git_pool p;
+	void *ptr;
+
+	git_pool_init(&p, 1);
+
+	for (i = 1; i < 10000; i *= 2) {
+		ptr = git_pool_malloc(&p, i);
+		cl_assert(ptr != NULL);
+		cl_assert(git_pool__ptr_in_pool(&p, ptr));
+		cl_assert(!git_pool__ptr_in_pool(&p, &i));
+	}
+
+	git_pool_clear(&p);
+}
+
+void test_core_pool__1(void)
+{
+	int i;
+	git_pool p;
+
+	git_pool_init(&p, 1);
+	p.page_size = 4000;
+
+	for (i = 2010; i > 0; i--)
+		cl_assert(git_pool_malloc(&p, i) != NULL);
+
+#ifndef GIT_DEBUG_POOL
+	/* with fixed page size, allocation must end up with these values */
+	cl_assert_equal_i(591, git_pool__open_pages(&p));
+#endif
+	git_pool_clear(&p);
+
+	git_pool_init(&p, 1);
+	p.page_size = 4120;
+
+	for (i = 2010; i > 0; i--)
+		cl_assert(git_pool_malloc(&p, i) != NULL);
+
+#ifndef GIT_DEBUG_POOL
+	/* with fixed page size, allocation must end up with these values */
+	cl_assert_equal_i(sizeof(void *) == 8 ? 575 : 573, git_pool__open_pages(&p));
+#endif
+	git_pool_clear(&p);
+}
+
+static char to_hex[] = "0123456789abcdef";
+
+void test_core_pool__2(void)
+{
+	git_pool p;
+	char oid_hex[GIT_OID_HEXSZ];
+	git_oid *oid;
+	int i, j;
+
+	memset(oid_hex, '0', sizeof(oid_hex));
+
+	git_pool_init(&p, sizeof(git_oid));
+	p.page_size = 4000;
+
+	for (i = 1000; i < 10000; i++) {
+		oid = git_pool_malloc(&p, 1);
+		cl_assert(oid != NULL);
+
+		for (j = 0; j < 8; j++)
+			oid_hex[j] = to_hex[(i >> (4 * j)) & 0x0f];
+		cl_git_pass(git_oid_fromstr(oid, oid_hex));
+	}
+
+#ifndef GIT_DEBUG_POOL
+	/* with fixed page size, allocation must end up with these values */
+	cl_assert_equal_i(sizeof(void *) == 8 ? 55 : 45, git_pool__open_pages(&p));
+#endif
+	git_pool_clear(&p);
+}
+
+void test_core_pool__strndup_limit(void)
+{
+	git_pool p;
+
+	git_pool_init(&p, 1);
+	/* ensure 64 bit doesn't overflow */
+	cl_assert(git_pool_strndup(&p, "foo", (size_t)-1) == NULL);
+	git_pool_clear(&p);
+}
+
diff --git a/tests/libgit2/core/posix.c b/tests/libgit2/core/posix.c
new file mode 100644
index 000000000..cba312913
--- /dev/null
+++ b/tests/libgit2/core/posix.c
@@ -0,0 +1,238 @@
+#ifndef _WIN32
+# include <arpa/inet.h>
+# include <sys/socket.h>
+# include <netinet/in.h>
+#else
+# include <ws2tcpip.h>
+# ifdef _MSC_VER
+#  pragma comment(lib, "ws2_32")
+# endif
+#endif
+
+#include "clar_libgit2.h"
+#include "futils.h"
+#include "posix.h"
+
+void test_core_posix__initialize(void)
+{
+#ifdef GIT_WIN32
+	/* on win32, the WSA context needs to be initialized
+	 * before any socket calls can be performed */
+	WSADATA wsd;
+
+	cl_git_pass(WSAStartup(MAKEWORD(2,2), &wsd));
+	cl_assert(LOBYTE(wsd.wVersion) == 2 && HIBYTE(wsd.wVersion) == 2);
+#endif
+}
+
+static bool supports_ipv6(void)
+{
+#ifdef GIT_WIN32
+	/* IPv6 is supported on Vista and newer */
+	return git_has_win32_version(6, 0, 0);
+#else
+	return 1;
+#endif
+}
+
+void test_core_posix__inet_pton(void)
+{
+	struct in_addr addr;
+	struct in6_addr addr6;
+	size_t i;
+
+	struct in_addr_data {
+		const char *p;
+		const uint8_t n[4];
+	};
+
+	struct in6_addr_data {
+		const char *p;
+		const uint8_t n[16];
+	};
+
+	static struct in_addr_data in_addr_data[] = {
+		{ "0.0.0.0", { 0, 0, 0, 0 } },
+		{ "10.42.101.8", { 10, 42, 101, 8 } },
+		{ "127.0.0.1", { 127, 0, 0, 1 } },
+		{ "140.177.10.12", { 140, 177, 10, 12 } },
+		{ "204.232.175.90", { 204, 232, 175, 90 } },
+		{ "255.255.255.255", { 255, 255, 255, 255 } },
+	};
+
+	static struct in6_addr_data in6_addr_data[] = {
+		{ "::", { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } },
+		{ "::1", { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } },
+		{ "0:0:0:0:0:0:0:1", { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } },
+		{ "2001:db8:8714:3a90::12", { 0x20, 0x01, 0x0d, 0xb8, 0x87, 0x14, 0x3a, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12 } },
+		{ "fe80::f8ba:c2d6:86be:3645", { 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0xba, 0xc2, 0xd6, 0x86, 0xbe, 0x36, 0x45 } },
+		{ "::ffff:204.152.189.116", { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xcc, 0x98, 0xbd, 0x74 } },
+	};
+
+	/* Test some ipv4 addresses */
+	for (i = 0; i < 6; i++) {
+		cl_assert(p_inet_pton(AF_INET, in_addr_data[i].p, &addr) == 1);
+		cl_assert(memcmp(&addr, in_addr_data[i].n, sizeof(struct in_addr)) == 0);
+	}
+
+	/* Test some ipv6 addresses */
+	if (supports_ipv6())
+	{
+		for (i = 0; i < 6; i++) {
+			cl_assert(p_inet_pton(AF_INET6, in6_addr_data[i].p, &addr6) == 1);
+			cl_assert(memcmp(&addr6, in6_addr_data[i].n, sizeof(struct in6_addr)) == 0);
+		}
+	}
+
+	/* Test some invalid strings */
+	cl_assert(p_inet_pton(AF_INET, "", &addr) == 0);
+	cl_assert(p_inet_pton(AF_INET, "foo", &addr) == 0);
+	cl_assert(p_inet_pton(AF_INET, " 127.0.0.1", &addr) == 0);
+	cl_assert(p_inet_pton(AF_INET, "bar", &addr) == 0);
+	cl_assert(p_inet_pton(AF_INET, "10.foo.bar.1", &addr) == 0);
+
+	/* Test unsupported address families */
+	cl_git_fail(p_inet_pton(INT_MAX-1, "52.472", &addr));
+	cl_assert_equal_i(EAFNOSUPPORT, errno);
+}
+
+void test_core_posix__utimes(void)
+{
+	struct p_timeval times[2];
+	struct stat st;
+	time_t curtime;
+	int fd;
+
+	/* test p_utimes */
+	times[0].tv_sec = 1234567890;
+	times[0].tv_usec = 0;
+	times[1].tv_sec = 1234567890;
+	times[1].tv_usec = 0;
+
+	cl_git_mkfile("foo", "Dummy file.");
+	cl_must_pass(p_utimes("foo", times));
+
+	cl_must_pass(p_stat("foo", &st));
+	cl_assert_equal_i(1234567890, st.st_atime);
+	cl_assert_equal_i(1234567890, st.st_mtime);
+
+
+	/* test p_futimes */
+	times[0].tv_sec = 1414141414;
+	times[0].tv_usec = 0;
+	times[1].tv_sec = 1414141414;
+	times[1].tv_usec = 0;
+
+	cl_must_pass(fd = p_open("foo", O_RDWR));
+	cl_must_pass(p_futimes(fd, times));
+	cl_must_pass(p_close(fd));
+
+	cl_must_pass(p_stat("foo", &st));
+	cl_assert_equal_i(1414141414, st.st_atime);
+	cl_assert_equal_i(1414141414, st.st_mtime);
+
+
+	/* test p_utimes with current time, assume that
+	 * it takes < 5 seconds to get the time...!
+	 */
+	cl_must_pass(p_utimes("foo", NULL));
+
+	curtime = time(NULL);
+	cl_must_pass(p_stat("foo", &st));
+	cl_assert((st.st_atime - curtime) < 5);
+	cl_assert((st.st_mtime - curtime) < 5);
+
+	cl_must_pass(p_unlink("foo"));
+}
+
+void test_core_posix__unlink_removes_symlink(void)
+{
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		clar__skip();
+
+	cl_git_mkfile("file", "Dummy file.");
+	cl_git_pass(git_futils_mkdir("dir", 0777, 0));
+
+	cl_must_pass(p_symlink("file", "file-symlink"));
+	cl_must_pass(p_symlink("dir", "dir-symlink"));
+
+	cl_must_pass(p_unlink("file-symlink"));
+	cl_must_pass(p_unlink("dir-symlink"));
+
+	cl_assert(git_fs_path_exists("file"));
+	cl_assert(git_fs_path_exists("dir"));
+
+	cl_must_pass(p_unlink("file"));
+	cl_must_pass(p_rmdir("dir"));
+}
+
+void test_core_posix__symlink_resolves_to_correct_type(void)
+{
+	git_str contents = GIT_STR_INIT;
+
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		clar__skip();
+
+	cl_must_pass(git_futils_mkdir("dir", 0777, 0));
+	cl_must_pass(git_futils_mkdir("file", 0777, 0));
+	cl_git_mkfile("dir/file", "symlink target");
+
+	cl_git_pass(p_symlink("file", "dir/link"));
+
+	cl_git_pass(git_futils_readbuffer(&contents, "dir/file"));
+	cl_assert_equal_s(contents.ptr, "symlink target");
+
+	cl_must_pass(p_unlink("dir/link"));
+	cl_must_pass(p_unlink("dir/file"));
+	cl_must_pass(p_rmdir("dir"));
+	cl_must_pass(p_rmdir("file"));
+
+	git_str_dispose(&contents);
+}
+
+void test_core_posix__relative_symlink(void)
+{
+	git_str contents = GIT_STR_INIT;
+
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		clar__skip();
+
+	cl_must_pass(git_futils_mkdir("dir", 0777, 0));
+	cl_git_mkfile("file", "contents");
+	cl_git_pass(p_symlink("../file", "dir/link"));
+	cl_git_pass(git_futils_readbuffer(&contents, "dir/link"));
+	cl_assert_equal_s(contents.ptr, "contents");
+
+	cl_must_pass(p_unlink("file"));
+	cl_must_pass(p_unlink("dir/link"));
+	cl_must_pass(p_rmdir("dir"));
+
+	git_str_dispose(&contents);
+}
+
+void test_core_posix__symlink_to_file_across_dirs(void)
+{
+	git_str contents = GIT_STR_INIT;
+
+	if (!git_fs_path_supports_symlinks(clar_sandbox_path()))
+		clar__skip();
+
+	/*
+	 * Create a relative symlink that points into another
+	 * directory. This used to not work on Win32, where we
+	 * forgot to convert directory separators to
+	 * Windows-style ones.
+	 */
+	cl_must_pass(git_futils_mkdir("dir", 0777, 0));
+	cl_git_mkfile("dir/target", "symlink target");
+	cl_git_pass(p_symlink("dir/target", "link"));
+
+	cl_git_pass(git_futils_readbuffer(&contents, "dir/target"));
+	cl_assert_equal_s(contents.ptr, "symlink target");
+
+	cl_must_pass(p_unlink("dir/target"));
+	cl_must_pass(p_unlink("link"));
+	cl_must_pass(p_rmdir("dir"));
+
+	git_str_dispose(&contents);
+}
diff --git a/tests/libgit2/core/pqueue.c b/tests/libgit2/core/pqueue.c
new file mode 100644
index 000000000..2b90f4172
--- /dev/null
+++ b/tests/libgit2/core/pqueue.c
@@ -0,0 +1,150 @@
+#include "clar_libgit2.h"
+#include "pqueue.h"
+
+static int cmp_ints(const void *v1, const void *v2)
+{
+	int i1 = *(int *)v1, i2 = *(int *)v2;
+	return (i1 < i2) ? -1 : (i1 > i2) ? 1 : 0;
+}
+
+void test_core_pqueue__items_are_put_in_order(void)
+{
+	git_pqueue pq;
+	int i, vals[20];
+
+	cl_git_pass(git_pqueue_init(&pq, 0, 20, cmp_ints));
+
+	for (i = 0; i < 20; ++i) {
+		if (i < 10)
+			vals[i] = 10 - i; /* 10 down to 1 */
+		else
+			vals[i] = i + 1;  /* 11 up to 20 */
+
+		cl_git_pass(git_pqueue_insert(&pq, &vals[i]));
+	}
+
+	cl_assert_equal_i(20, git_pqueue_size(&pq));
+
+	for (i = 1; i <= 20; ++i) {
+		void *p = git_pqueue_pop(&pq);
+		cl_assert(p);
+		cl_assert_equal_i(i, *(int *)p);
+	}
+
+	cl_assert_equal_i(0, git_pqueue_size(&pq));
+
+	git_pqueue_free(&pq);
+}
+
+void test_core_pqueue__interleave_inserts_and_pops(void)
+{
+	git_pqueue pq;
+	int chunk, v, i, vals[200];
+
+	cl_git_pass(git_pqueue_init(&pq, 0, 20, cmp_ints));
+
+	for (v = 0, chunk = 20; chunk <= 200; chunk += 20) {
+		/* push the next 20 */
+		for (; v < chunk; ++v) {
+			vals[v] = (v & 1) ? 200 - v : v;
+			cl_git_pass(git_pqueue_insert(&pq, &vals[v]));
+		}
+
+		/* pop the lowest 10 */
+		for (i = 0; i < 10; ++i)
+			(void)git_pqueue_pop(&pq);
+	}
+
+	cl_assert_equal_i(100, git_pqueue_size(&pq));
+
+	/* at this point, we've popped 0-99 */
+
+	for (v = 100; v < 200; ++v) {
+		void *p = git_pqueue_pop(&pq);
+		cl_assert(p);
+		cl_assert_equal_i(v, *(int *)p);
+	}
+
+	cl_assert_equal_i(0, git_pqueue_size(&pq));
+
+	git_pqueue_free(&pq);
+}
+
+void test_core_pqueue__max_heap_size(void)
+{
+	git_pqueue pq;
+	int i, vals[100];
+
+	cl_git_pass(git_pqueue_init(&pq, GIT_PQUEUE_FIXED_SIZE, 50, cmp_ints));
+
+	for (i = 0; i < 100; ++i) {
+		vals[i] = (i & 1) ? 100 - i : i;
+		cl_git_pass(git_pqueue_insert(&pq, &vals[i]));
+	}
+
+	cl_assert_equal_i(50, git_pqueue_size(&pq));
+
+	for (i = 50; i < 100; ++i) {
+		void *p = git_pqueue_pop(&pq);
+		cl_assert(p);
+		cl_assert_equal_i(i, *(int *)p);
+	}
+
+	cl_assert_equal_i(0, git_pqueue_size(&pq));
+
+	git_pqueue_free(&pq);
+}
+
+void test_core_pqueue__max_heap_size_without_comparison(void)
+{
+	git_pqueue pq;
+	int i, vals[100] = { 0 };
+
+	cl_git_pass(git_pqueue_init(&pq, GIT_PQUEUE_FIXED_SIZE, 50, NULL));
+
+	for (i = 0; i < 100; ++i)
+		cl_git_pass(git_pqueue_insert(&pq, &vals[i]));
+
+	cl_assert_equal_i(50, git_pqueue_size(&pq));
+
+	/* As we have no comparison function, we cannot make any
+	 * actual assumptions about which entries are part of the
+	 * pqueue */
+	for (i = 0; i < 50; ++i)
+		cl_assert(git_pqueue_pop(&pq));
+
+	cl_assert_equal_i(0, git_pqueue_size(&pq));
+
+	git_pqueue_free(&pq);
+}
+
+static int cmp_ints_like_commit_time(const void *a, const void *b)
+{
+	return *((const int *)a) < *((const int *)b);
+}
+
+void test_core_pqueue__interleaved_pushes_and_pops(void)
+{
+	git_pqueue pq;
+	int i, j, *val;
+	static int commands[] =
+		{ 6, 9, 8, 0, 5, 0, 7, 0, 4, 3, 0, 0, 0, 4, 0, 2, 0, 1, 0, 0, -1 };
+	static int expected[] =
+		{ 9, 8, 7, 6, 5, 4, 4, 3, 2, 1, -1 };
+
+	cl_git_pass(git_pqueue_init(&pq, 0, 10, cmp_ints_like_commit_time));
+
+	for (i = 0, j = 0; commands[i] >= 0; ++i) {
+		if (!commands[i]) {
+			cl_assert((val = git_pqueue_pop(&pq)) != NULL);
+			cl_assert_equal_i(expected[j], *val);
+			++j;
+		} else {
+			cl_git_pass(git_pqueue_insert(&pq, &commands[i]));
+		}
+	}
+
+	cl_assert_equal_i(0, git_pqueue_size(&pq));
+	git_pqueue_free(&pq);
+}
+
diff --git a/tests/libgit2/core/qsort.c b/tests/libgit2/core/qsort.c
new file mode 100644
index 000000000..efb79e6e9
--- /dev/null
+++ b/tests/libgit2/core/qsort.c
@@ -0,0 +1,90 @@
+#include "clar_libgit2.h"
+
+#define assert_sorted(a, cmp) \
+	_assert_sorted(a, ARRAY_SIZE(a), sizeof(*a), cmp)
+
+struct big_entries {
+	char c[311];
+};
+
+static void _assert_sorted(void *els, size_t n, size_t elsize, git__sort_r_cmp cmp)
+{
+	int8_t *p = els;
+
+	git__qsort_r(p, n, elsize, cmp, NULL);
+	while (n-- > 1) {
+		cl_assert(cmp(p, p + elsize, NULL) <= 0);
+		p += elsize;
+	}
+}
+
+static int cmp_big(const void *_a, const void *_b, void *payload)
+{
+	const struct big_entries *a = (const struct big_entries *)_a, *b = (const struct big_entries *)_b;
+	GIT_UNUSED(payload);
+	return (a->c[0] < b->c[0]) ? -1 : (a->c[0] > b->c[0]) ? +1 : 0;
+}
+
+static int cmp_int(const void *_a, const void *_b, void *payload)
+{
+	int a = *(const int *)_a, b = *(const int *)_b;
+	GIT_UNUSED(payload);
+	return (a < b) ? -1 : (a > b) ? +1 : 0;
+}
+
+static int cmp_str(const void *_a, const void *_b, void *payload)
+{
+	GIT_UNUSED(payload);
+	return strcmp((const char *) _a, (const char *) _b);
+}
+
+void test_core_qsort__array_with_single_entry(void)
+{
+	int a[] = { 10 };
+	assert_sorted(a, cmp_int);
+}
+
+void test_core_qsort__array_with_equal_entries(void)
+{
+	int a[] = { 4, 4, 4, 4 };
+	assert_sorted(a, cmp_int);
+}
+
+void test_core_qsort__sorted_array(void)
+{
+	int a[] = { 1, 10 };
+	assert_sorted(a, cmp_int);
+}
+
+void test_core_qsort__unsorted_array(void)
+{
+	int a[] = { 123, 9, 412938, 10, 234, 89 };
+	assert_sorted(a, cmp_int);
+}
+
+void test_core_qsort__sorting_strings(void)
+{
+	char *a[] = { "foo", "bar", "baz" };
+	assert_sorted(a, cmp_str);
+}
+
+void test_core_qsort__sorting_big_entries(void)
+{
+	struct big_entries a[5];
+
+	memset(&a, 0, sizeof(a));
+
+	memset(a[0].c, 'w', sizeof(a[0].c) - 1);
+	memset(a[1].c, 'c', sizeof(a[1].c) - 1);
+	memset(a[2].c, 'w', sizeof(a[2].c) - 1);
+	memset(a[3].c, 'h', sizeof(a[3].c) - 1);
+	memset(a[4].c, 'a', sizeof(a[4].c) - 1);
+
+	assert_sorted(a, cmp_big);
+
+	cl_assert_equal_i(strspn(a[0].c, "a"), sizeof(a[0].c) - 1);
+	cl_assert_equal_i(strspn(a[1].c, "c"), sizeof(a[1].c) - 1);
+	cl_assert_equal_i(strspn(a[2].c, "h"), sizeof(a[2].c) - 1);
+	cl_assert_equal_i(strspn(a[3].c, "w"), sizeof(a[3].c) - 1);
+	cl_assert_equal_i(strspn(a[4].c, "w"), sizeof(a[4].c) - 1);
+}
diff --git a/tests/libgit2/core/regexp.c b/tests/libgit2/core/regexp.c
new file mode 100644
index 000000000..8db5641e5
--- /dev/null
+++ b/tests/libgit2/core/regexp.c
@@ -0,0 +1,213 @@
+#include "clar_libgit2.h"
+
+#include <locale.h>
+
+#include "regexp.h"
+#include "userdiff.h"
+
+#if LC_ALL > 0
+static const char *old_locales[LC_ALL];
+#endif
+
+static git_regexp regex;
+
+void test_core_regexp__initialize(void)
+{
+#if LC_ALL > 0
+	memset(&old_locales, 0, sizeof(old_locales));
+#endif
+}
+
+void test_core_regexp__cleanup(void)
+{
+	git_regexp_dispose(&regex);
+}
+
+static void try_set_locale(int category)
+{
+#if LC_ALL > 0
+	old_locales[category] = setlocale(category, NULL);
+#endif
+
+	if (!setlocale(category, "UTF-8") &&
+	    !setlocale(category, "c.utf8") &&
+	    !setlocale(category, "en_US.UTF-8"))
+		cl_skip();
+
+	if (MB_CUR_MAX == 1)
+		cl_fail("Expected locale to be switched to multibyte");
+}
+
+
+void test_core_regexp__compile_ignores_global_locale_ctype(void)
+{
+	try_set_locale(LC_CTYPE);
+	cl_git_pass(git_regexp_compile(&regex, "[\xc0-\xff][\x80-\xbf]", 0));
+}
+
+void test_core_regexp__compile_ignores_global_locale_collate(void)
+{
+#ifdef GIT_WIN32
+	cl_skip();
+#endif
+
+	try_set_locale(LC_COLLATE);
+	cl_git_pass(git_regexp_compile(&regex, "[\xc0-\xff][\x80-\xbf]", 0));
+}
+
+void test_core_regexp__regex_matches_digits_with_locale(void)
+{
+	char c, str[2];
+
+#ifdef GIT_WIN32
+	cl_skip();
+#endif
+
+	try_set_locale(LC_COLLATE);
+	try_set_locale(LC_CTYPE);
+
+	cl_git_pass(git_regexp_compile(&regex, "[[:digit:]]", 0));
+
+	str[1] = '\0';
+	for (c = '0'; c <= '9'; c++) {
+	    str[0] = c;
+	    cl_git_pass(git_regexp_match(&regex, str));
+	}
+}
+
+void test_core_regexp__regex_matches_alphabet_with_locale(void)
+{
+	char c, str[2];
+
+#ifdef GIT_WIN32
+	cl_skip();
+#endif
+
+	try_set_locale(LC_COLLATE);
+	try_set_locale(LC_CTYPE);
+
+	cl_git_pass(git_regexp_compile(&regex, "[[:alpha:]]", 0));
+
+	str[1] = '\0';
+	for (c = 'a'; c <= 'z'; c++) {
+	    str[0] = c;
+	    cl_git_pass(git_regexp_match(&regex, str));
+	}
+	for (c = 'A'; c <= 'Z'; c++) {
+	    str[0] = c;
+	    cl_git_pass(git_regexp_match(&regex, str));
+	}
+}
+
+void test_core_regexp__compile_userdiff_regexps(void)
+{
+	size_t idx;
+
+	for (idx = 0; idx < ARRAY_SIZE(builtin_defs); ++idx) {
+		git_diff_driver_definition ddef = builtin_defs[idx];
+
+		cl_git_pass(git_regexp_compile(&regex, ddef.fns, ddef.flags));
+		git_regexp_dispose(&regex);
+
+		cl_git_pass(git_regexp_compile(&regex, ddef.words, 0));
+		git_regexp_dispose(&regex);
+	}
+}
+
+void test_core_regexp__simple_search_matches(void)
+{
+	cl_git_pass(git_regexp_compile(&regex, "a", 0));
+	cl_git_pass(git_regexp_search(&regex, "a", 0, NULL));
+}
+
+void test_core_regexp__case_insensitive_search_matches(void)
+{
+	cl_git_pass(git_regexp_compile(&regex, "a", GIT_REGEXP_ICASE));
+	cl_git_pass(git_regexp_search(&regex, "A", 0, NULL));
+}
+
+void test_core_regexp__nonmatching_search_returns_error(void)
+{
+	cl_git_pass(git_regexp_compile(&regex, "a", 0));
+	cl_git_fail(git_regexp_search(&regex, "b", 0, NULL));
+}
+
+void test_core_regexp__search_finds_complete_match(void)
+{
+	git_regmatch matches[1];
+
+	cl_git_pass(git_regexp_compile(&regex, "abc", 0));
+	cl_git_pass(git_regexp_search(&regex, "abc", 1, matches));
+	cl_assert_equal_i(matches[0].start, 0);
+	cl_assert_equal_i(matches[0].end, 3);
+}
+
+void test_core_regexp__search_finds_correct_offsets(void)
+{
+	git_regmatch matches[3];
+
+	cl_git_pass(git_regexp_compile(&regex, "(a*)(b*)", 0));
+	cl_git_pass(git_regexp_search(&regex, "ab", 3, matches));
+	cl_assert_equal_i(matches[0].start, 0);
+	cl_assert_equal_i(matches[0].end, 2);
+	cl_assert_equal_i(matches[1].start, 0);
+	cl_assert_equal_i(matches[1].end, 1);
+	cl_assert_equal_i(matches[2].start, 1);
+	cl_assert_equal_i(matches[2].end, 2);
+}
+
+void test_core_regexp__search_finds_empty_group(void)
+{
+	git_regmatch matches[3];
+
+	cl_git_pass(git_regexp_compile(&regex, "(a*)(b*)c", 0));
+	cl_git_pass(git_regexp_search(&regex, "ac", 3, matches));
+	cl_assert_equal_i(matches[0].start, 0);
+	cl_assert_equal_i(matches[0].end, 2);
+	cl_assert_equal_i(matches[1].start, 0);
+	cl_assert_equal_i(matches[1].end, 1);
+	cl_assert_equal_i(matches[2].start, 1);
+	cl_assert_equal_i(matches[2].end, 1);
+}
+
+void test_core_regexp__search_fills_matches_with_first_matching_groups(void)
+{
+	git_regmatch matches[2];
+
+	cl_git_pass(git_regexp_compile(&regex, "(a)(b)(c)", 0));
+	cl_git_pass(git_regexp_search(&regex, "abc", 2, matches));
+	cl_assert_equal_i(matches[0].start, 0);
+	cl_assert_equal_i(matches[0].end, 3);
+	cl_assert_equal_i(matches[1].start, 0);
+	cl_assert_equal_i(matches[1].end, 1);
+}
+
+void test_core_regexp__search_skips_nonmatching_group(void)
+{
+	git_regmatch matches[4];
+
+	cl_git_pass(git_regexp_compile(&regex, "(a)(b)?(c)", 0));
+	cl_git_pass(git_regexp_search(&regex, "ac", 4, matches));
+	cl_assert_equal_i(matches[0].start, 0);
+	cl_assert_equal_i(matches[0].end, 2);
+	cl_assert_equal_i(matches[1].start, 0);
+	cl_assert_equal_i(matches[1].end, 1);
+	cl_assert_equal_i(matches[2].start, -1);
+	cl_assert_equal_i(matches[2].end, -1);
+	cl_assert_equal_i(matches[3].start, 1);
+	cl_assert_equal_i(matches[3].end, 2);
+}
+
+void test_core_regexp__search_initializes_trailing_nonmatching_groups(void)
+{
+	git_regmatch matches[3];
+
+	cl_git_pass(git_regexp_compile(&regex, "(a)bc", 0));
+	cl_git_pass(git_regexp_search(&regex, "abc", 3, matches));
+	cl_assert_equal_i(matches[0].start, 0);
+	cl_assert_equal_i(matches[0].end, 3);
+	cl_assert_equal_i(matches[1].start, 0);
+	cl_assert_equal_i(matches[1].end, 1);
+	cl_assert_equal_i(matches[2].start, -1);
+	cl_assert_equal_i(matches[2].end, -1);
+}
diff --git a/tests/libgit2/core/rmdir.c b/tests/libgit2/core/rmdir.c
new file mode 100644
index 000000000..f6c66b3a4
--- /dev/null
+++ b/tests/libgit2/core/rmdir.c
@@ -0,0 +1,120 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+
+static const char *empty_tmp_dir = "test_gitfo_rmdir_recurs_test";
+
+void test_core_rmdir__initialize(void)
+{
+	git_str path = GIT_STR_INIT;
+
+	cl_must_pass(p_mkdir(empty_tmp_dir, 0777));
+
+	cl_git_pass(git_str_joinpath(&path, empty_tmp_dir, "/one"));
+	cl_must_pass(p_mkdir(path.ptr, 0777));
+
+	cl_git_pass(git_str_joinpath(&path, empty_tmp_dir, "/one/two_one"));
+	cl_must_pass(p_mkdir(path.ptr, 0777));
+
+	cl_git_pass(git_str_joinpath(&path, empty_tmp_dir, "/one/two_two"));
+	cl_must_pass(p_mkdir(path.ptr, 0777));
+
+	cl_git_pass(git_str_joinpath(&path, empty_tmp_dir, "/one/two_two/three"));
+	cl_must_pass(p_mkdir(path.ptr, 0777));
+
+	cl_git_pass(git_str_joinpath(&path, empty_tmp_dir, "/two"));
+	cl_must_pass(p_mkdir(path.ptr, 0777));
+
+	git_str_dispose(&path);
+}
+
+void test_core_rmdir__cleanup(void)
+{
+	if (git_fs_path_exists(empty_tmp_dir))
+		cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_REMOVE_FILES));
+}
+
+/* make sure empty dir can be deleted recursively */
+void test_core_rmdir__delete_recursive(void)
+{
+	git_str path = GIT_STR_INIT;
+	cl_git_pass(git_str_joinpath(&path, empty_tmp_dir, "/one"));
+	cl_assert(git_fs_path_exists(git_str_cstr(&path)));
+
+	cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_EMPTY_HIERARCHY));
+
+	cl_assert(!git_fs_path_exists(git_str_cstr(&path)));
+
+	git_str_dispose(&path);
+}
+
+/* make sure non-empty dir cannot be deleted recursively */
+void test_core_rmdir__fail_to_delete_non_empty_dir(void)
+{
+	git_str file = GIT_STR_INIT;
+
+	cl_git_pass(git_str_joinpath(&file, empty_tmp_dir, "/two/file.txt"));
+
+	cl_git_mkfile(git_str_cstr(&file), "dummy");
+
+	cl_git_fail(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_EMPTY_HIERARCHY));
+
+	cl_must_pass(p_unlink(file.ptr));
+	cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_EMPTY_HIERARCHY));
+
+	cl_assert(!git_fs_path_exists(empty_tmp_dir));
+
+	git_str_dispose(&file);
+}
+
+void test_core_rmdir__keep_base(void)
+{
+	cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_SKIP_ROOT));
+	cl_assert(git_fs_path_exists(empty_tmp_dir));
+}
+
+void test_core_rmdir__can_skip_non_empty_dir(void)
+{
+	git_str file = GIT_STR_INIT;
+
+	cl_git_pass(git_str_joinpath(&file, empty_tmp_dir, "/two/file.txt"));
+
+	cl_git_mkfile(git_str_cstr(&file), "dummy");
+
+	cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_SKIP_NONEMPTY));
+	cl_assert(git_fs_path_exists(git_str_cstr(&file)) == true);
+
+	cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_REMOVE_FILES));
+	cl_assert(git_fs_path_exists(empty_tmp_dir) == false);
+
+	git_str_dispose(&file);
+}
+
+void test_core_rmdir__can_remove_empty_parents(void)
+{
+	git_str file = GIT_STR_INIT;
+
+	cl_git_pass(
+		git_str_joinpath(&file, empty_tmp_dir, "/one/two_two/three/file.txt"));
+	cl_git_mkfile(git_str_cstr(&file), "dummy");
+	cl_assert(git_fs_path_isfile(git_str_cstr(&file)));
+
+	cl_git_pass(git_futils_rmdir_r("one/two_two/three/file.txt", empty_tmp_dir,
+		GIT_RMDIR_REMOVE_FILES | GIT_RMDIR_EMPTY_PARENTS));
+
+	cl_assert(!git_fs_path_exists(git_str_cstr(&file)));
+
+	git_str_rtruncate_at_char(&file, '/'); /* three (only contained file.txt) */
+	cl_assert(!git_fs_path_exists(git_str_cstr(&file)));
+
+	git_str_rtruncate_at_char(&file, '/'); /* two_two (only contained three) */
+	cl_assert(!git_fs_path_exists(git_str_cstr(&file)));
+
+	git_str_rtruncate_at_char(&file, '/'); /* one (contained two_one also) */
+	cl_assert(git_fs_path_exists(git_str_cstr(&file)));
+
+	cl_assert(git_fs_path_exists(empty_tmp_dir) == true);
+
+	git_str_dispose(&file);
+
+	cl_git_pass(git_futils_rmdir_r(empty_tmp_dir, NULL, GIT_RMDIR_EMPTY_HIERARCHY));
+}
diff --git a/tests/libgit2/core/sha1.c b/tests/libgit2/core/sha1.c
new file mode 100644
index 000000000..9ccdaab3c
--- /dev/null
+++ b/tests/libgit2/core/sha1.c
@@ -0,0 +1,70 @@
+#include "clar_libgit2.h"
+#include "hash.h"
+
+#define FIXTURE_DIR "sha1"
+
+void test_core_sha1__initialize(void)
+{
+	cl_fixture_sandbox(FIXTURE_DIR);
+}
+
+void test_core_sha1__cleanup(void)
+{
+	cl_fixture_cleanup(FIXTURE_DIR);
+}
+
+static int sha1_file(unsigned char *out, const char *filename)
+{
+	git_hash_ctx ctx;
+	char buf[2048];
+	int fd, ret;
+	ssize_t read_len;
+
+	fd = p_open(filename, O_RDONLY);
+	cl_assert(fd >= 0);
+
+	cl_git_pass(git_hash_ctx_init(&ctx, GIT_HASH_ALGORITHM_SHA1));
+
+	while ((read_len = p_read(fd, buf, 2048)) > 0)
+		cl_git_pass(git_hash_update(&ctx, buf, (size_t)read_len));
+
+	cl_assert_equal_i(0, read_len);
+	p_close(fd);
+
+	ret = git_hash_final(out, &ctx);
+	git_hash_ctx_cleanup(&ctx);
+
+	return ret;
+}
+
+void test_core_sha1__sum(void)
+{
+	unsigned char expected[GIT_HASH_SHA1_SIZE] = {
+		0x4e, 0x72, 0x67, 0x9e, 0x3e, 0xa4, 0xd0, 0x4e, 0x0c, 0x64,
+		0x2f, 0x02, 0x9e, 0x61, 0xeb, 0x80, 0x56, 0xc7, 0xed, 0x94
+	};
+	unsigned char actual[GIT_HASH_SHA1_SIZE];
+
+	cl_git_pass(sha1_file(actual, FIXTURE_DIR "/hello_c"));
+	cl_assert_equal_i(0, memcmp(expected, actual, GIT_HASH_SHA1_SIZE));
+}
+
+/* test that sha1 collision detection works when enabled */
+void test_core_sha1__detect_collision_attack(void)
+{
+	unsigned char actual[GIT_HASH_SHA1_SIZE];
+	unsigned char expected[GIT_HASH_SHA1_SIZE] = {
+		0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17,
+		0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a
+	};
+
+#ifdef GIT_SHA1_COLLISIONDETECT
+	GIT_UNUSED(&expected);
+	cl_git_fail(sha1_file(actual, FIXTURE_DIR "/shattered-1.pdf"));
+	cl_assert_equal_s("SHA1 collision attack detected", git_error_last()->message);
+#else
+	cl_git_pass(sha1_file(actual, FIXTURE_DIR "/shattered-1.pdf"));
+	cl_assert_equal_i(0, memcmp(expected, actual, GIT_HASH_SHA1_SIZE));
+#endif
+}
+
diff --git a/tests/libgit2/core/sortedcache.c b/tests/libgit2/core/sortedcache.c
new file mode 100644
index 000000000..cb4e34efa
--- /dev/null
+++ b/tests/libgit2/core/sortedcache.c
@@ -0,0 +1,363 @@
+#include "clar_libgit2.h"
+#include "sortedcache.h"
+
+static int name_only_cmp(const void *a, const void *b)
+{
+	return strcmp(a, b);
+}
+
+void test_core_sortedcache__name_only(void)
+{
+	git_sortedcache *sc;
+	void *item;
+	size_t pos;
+
+	cl_git_pass(git_sortedcache_new(
+		&sc, 0, NULL, NULL, name_only_cmp, NULL));
+
+	cl_git_pass(git_sortedcache_wlock(sc));
+	cl_git_pass(git_sortedcache_upsert(&item, sc, "aaa"));
+	cl_git_pass(git_sortedcache_upsert(&item, sc, "bbb"));
+	cl_git_pass(git_sortedcache_upsert(&item, sc, "zzz"));
+	cl_git_pass(git_sortedcache_upsert(&item, sc, "mmm"));
+	cl_git_pass(git_sortedcache_upsert(&item, sc, "iii"));
+	git_sortedcache_wunlock(sc);
+
+	cl_assert_equal_sz(5, git_sortedcache_entrycount(sc));
+
+	cl_assert((item = git_sortedcache_lookup(sc, "aaa")) != NULL);
+	cl_assert_equal_s("aaa", item);
+	cl_assert((item = git_sortedcache_lookup(sc, "mmm")) != NULL);
+	cl_assert_equal_s("mmm", item);
+	cl_assert((item = git_sortedcache_lookup(sc, "zzz")) != NULL);
+	cl_assert_equal_s("zzz", item);
+	cl_assert(git_sortedcache_lookup(sc, "qqq") == NULL);
+
+	cl_assert((item = git_sortedcache_entry(sc, 0)) != NULL);
+	cl_assert_equal_s("aaa", item);
+	cl_assert((item = git_sortedcache_entry(sc, 1)) != NULL);
+	cl_assert_equal_s("bbb", item);
+	cl_assert((item = git_sortedcache_entry(sc, 2)) != NULL);
+	cl_assert_equal_s("iii", item);
+	cl_assert((item = git_sortedcache_entry(sc, 3)) != NULL);
+	cl_assert_equal_s("mmm", item);
+	cl_assert((item = git_sortedcache_entry(sc, 4)) != NULL);
+	cl_assert_equal_s("zzz", item);
+	cl_assert(git_sortedcache_entry(sc, 5) == NULL);
+
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "aaa"));
+	cl_assert_equal_sz(0, pos);
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "iii"));
+	cl_assert_equal_sz(2, pos);
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "zzz"));
+	cl_assert_equal_sz(4, pos);
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sortedcache_lookup_index(&pos, sc, "abc"));
+
+	cl_git_pass(git_sortedcache_clear(sc, true));
+
+	cl_assert_equal_sz(0, git_sortedcache_entrycount(sc));
+	cl_assert(git_sortedcache_entry(sc, 0) == NULL);
+	cl_assert(git_sortedcache_lookup(sc, "aaa") == NULL);
+	cl_assert(git_sortedcache_entry(sc, 0) == NULL);
+
+	git_sortedcache_free(sc);
+}
+
+typedef struct {
+	int value;
+	char smaller_value;
+	char path[GIT_FLEX_ARRAY];
+} sortedcache_test_struct;
+
+static int sortedcache_test_struct_cmp(const void *a_, const void *b_)
+{
+	const sortedcache_test_struct *a = a_, *b = b_;
+	return strcmp(a->path, b->path);
+}
+
+static void sortedcache_test_struct_free(void *payload, void *item_)
+{
+	sortedcache_test_struct *item = item_;
+	int *count = payload;
+	(*count)++;
+	item->smaller_value = 0;
+}
+
+void test_core_sortedcache__in_memory(void)
+{
+	git_sortedcache *sc;
+	sortedcache_test_struct *item;
+	int free_count = 0;
+
+	cl_git_pass(git_sortedcache_new(
+		&sc, offsetof(sortedcache_test_struct, path),
+		sortedcache_test_struct_free, &free_count,
+		sortedcache_test_struct_cmp, NULL));
+
+	cl_git_pass(git_sortedcache_wlock(sc));
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "aaa"));
+	item->value = 10;
+	item->smaller_value = 1;
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "bbb"));
+	item->value = 20;
+	item->smaller_value = 2;
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "zzz"));
+	item->value = 30;
+	item->smaller_value = 26;
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "mmm"));
+	item->value = 40;
+	item->smaller_value = 14;
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "iii"));
+	item->value = 50;
+	item->smaller_value = 9;
+	git_sortedcache_wunlock(sc);
+
+	cl_assert_equal_sz(5, git_sortedcache_entrycount(sc));
+
+	cl_git_pass(git_sortedcache_rlock(sc));
+
+	cl_assert((item = git_sortedcache_lookup(sc, "aaa")) != NULL);
+	cl_assert_equal_s("aaa", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert((item = git_sortedcache_lookup(sc, "mmm")) != NULL);
+	cl_assert_equal_s("mmm", item->path);
+	cl_assert_equal_i(40, item->value);
+	cl_assert((item = git_sortedcache_lookup(sc, "zzz")) != NULL);
+	cl_assert_equal_s("zzz", item->path);
+	cl_assert_equal_i(30, item->value);
+	cl_assert(git_sortedcache_lookup(sc, "abc") == NULL);
+
+	/* not on Windows:
+	 * cl_git_pass(git_sortedcache_rlock(sc)); -- grab more than one
+	 */
+
+	cl_assert((item = git_sortedcache_entry(sc, 0)) != NULL);
+	cl_assert_equal_s("aaa", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 1)) != NULL);
+	cl_assert_equal_s("bbb", item->path);
+	cl_assert_equal_i(20, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 2)) != NULL);
+	cl_assert_equal_s("iii", item->path);
+	cl_assert_equal_i(50, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 3)) != NULL);
+	cl_assert_equal_s("mmm", item->path);
+	cl_assert_equal_i(40, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 4)) != NULL);
+	cl_assert_equal_s("zzz", item->path);
+	cl_assert_equal_i(30, item->value);
+	cl_assert(git_sortedcache_entry(sc, 5) == NULL);
+
+	git_sortedcache_runlock(sc);
+	/* git_sortedcache_runlock(sc); */
+
+	cl_assert_equal_i(0, free_count);
+
+	cl_git_pass(git_sortedcache_clear(sc, true));
+
+	cl_assert_equal_i(5, free_count);
+
+	cl_assert_equal_sz(0, git_sortedcache_entrycount(sc));
+	cl_assert(git_sortedcache_entry(sc, 0) == NULL);
+	cl_assert(git_sortedcache_lookup(sc, "aaa") == NULL);
+	cl_assert(git_sortedcache_entry(sc, 0) == NULL);
+
+	free_count = 0;
+
+	cl_git_pass(git_sortedcache_wlock(sc));
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "testing"));
+	item->value = 10;
+	item->smaller_value = 3;
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "again"));
+	item->value = 20;
+	item->smaller_value = 1;
+	cl_git_pass(git_sortedcache_upsert((void **)&item, sc, "final"));
+	item->value = 30;
+	item->smaller_value = 2;
+	git_sortedcache_wunlock(sc);
+
+	cl_assert_equal_sz(3, git_sortedcache_entrycount(sc));
+
+	cl_assert((item = git_sortedcache_lookup(sc, "testing")) != NULL);
+	cl_assert_equal_s("testing", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert((item = git_sortedcache_lookup(sc, "again")) != NULL);
+	cl_assert_equal_s("again", item->path);
+	cl_assert_equal_i(20, item->value);
+	cl_assert((item = git_sortedcache_lookup(sc, "final")) != NULL);
+	cl_assert_equal_s("final", item->path);
+	cl_assert_equal_i(30, item->value);
+	cl_assert(git_sortedcache_lookup(sc, "zzz") == NULL);
+
+	cl_assert((item = git_sortedcache_entry(sc, 0)) != NULL);
+	cl_assert_equal_s("again", item->path);
+	cl_assert_equal_i(20, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 1)) != NULL);
+	cl_assert_equal_s("final", item->path);
+	cl_assert_equal_i(30, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 2)) != NULL);
+	cl_assert_equal_s("testing", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert(git_sortedcache_entry(sc, 3) == NULL);
+
+	{
+		size_t pos;
+
+		cl_git_pass(git_sortedcache_wlock(sc));
+
+		cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "again"));
+		cl_assert_equal_sz(0, pos);
+		cl_git_pass(git_sortedcache_remove(sc, pos));
+		cl_assert_equal_i(
+			GIT_ENOTFOUND, git_sortedcache_lookup_index(&pos, sc, "again"));
+
+		cl_assert_equal_sz(2, git_sortedcache_entrycount(sc));
+
+		cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "testing"));
+		cl_assert_equal_sz(1, pos);
+		cl_git_pass(git_sortedcache_remove(sc, pos));
+		cl_assert_equal_i(
+			GIT_ENOTFOUND, git_sortedcache_lookup_index(&pos, sc, "testing"));
+
+		cl_assert_equal_sz(1, git_sortedcache_entrycount(sc));
+
+		cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "final"));
+		cl_assert_equal_sz(0, pos);
+		cl_git_pass(git_sortedcache_remove(sc, pos));
+		cl_assert_equal_i(
+			GIT_ENOTFOUND, git_sortedcache_lookup_index(&pos, sc, "final"));
+
+		cl_assert_equal_sz(0, git_sortedcache_entrycount(sc));
+
+		git_sortedcache_wunlock(sc);
+	}
+
+	git_sortedcache_free(sc);
+
+	cl_assert_equal_i(3, free_count);
+}
+
+static void sortedcache_test_reload(git_sortedcache *sc)
+{
+	int count = 0;
+	git_str buf = GIT_STR_INIT;
+	char *scan, *after;
+	sortedcache_test_struct *item;
+
+	cl_assert(git_sortedcache_lockandload(sc, &buf) > 0);
+
+	cl_git_pass(git_sortedcache_clear(sc, false)); /* clear once we already have lock */
+
+	for (scan = buf.ptr; *scan; scan = after + 1) {
+		int val = strtol(scan, &after, 0);
+		cl_assert(after > scan);
+		scan = after;
+
+		for (scan = after; git__isspace(*scan); ++scan) /* find start */;
+		for (after = scan; *after && *after != '\n'; ++after) /* find eol */;
+		*after = '\0';
+
+		cl_git_pass(git_sortedcache_upsert((void **)&item, sc, scan));
+
+		item->value = val;
+		item->smaller_value = (char)(count++);
+	}
+
+	git_sortedcache_wunlock(sc);
+
+	git_str_dispose(&buf);
+}
+
+void test_core_sortedcache__on_disk(void)
+{
+	git_sortedcache *sc;
+	sortedcache_test_struct *item;
+	int free_count = 0;
+	size_t pos;
+
+	cl_git_mkfile("cacheitems.txt", "10 abc\n20 bcd\n30 cde\n");
+
+	cl_git_pass(git_sortedcache_new(
+		&sc, offsetof(sortedcache_test_struct, path),
+		sortedcache_test_struct_free, &free_count,
+		sortedcache_test_struct_cmp, "cacheitems.txt"));
+
+	/* should need to reload the first time */
+
+	sortedcache_test_reload(sc);
+
+	/* test what we loaded */
+
+	cl_assert_equal_sz(3, git_sortedcache_entrycount(sc));
+
+	cl_assert((item = git_sortedcache_lookup(sc, "abc")) != NULL);
+	cl_assert_equal_s("abc", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert((item = git_sortedcache_lookup(sc, "cde")) != NULL);
+	cl_assert_equal_s("cde", item->path);
+	cl_assert_equal_i(30, item->value);
+	cl_assert(git_sortedcache_lookup(sc, "aaa") == NULL);
+
+	cl_assert((item = git_sortedcache_entry(sc, 0)) != NULL);
+	cl_assert_equal_s("abc", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 1)) != NULL);
+	cl_assert_equal_s("bcd", item->path);
+	cl_assert_equal_i(20, item->value);
+	cl_assert(git_sortedcache_entry(sc, 3) == NULL);
+
+	/* should not need to reload this time */
+
+	cl_assert_equal_i(0, git_sortedcache_lockandload(sc, NULL));
+
+	/* rewrite ondisk file and reload */
+
+	cl_assert_equal_i(0, free_count);
+
+	cl_git_rewritefile(
+		"cacheitems.txt", "100 abc\n200 zzz\n500 aaa\n10 final\n");
+	sortedcache_test_reload(sc);
+
+	cl_assert_equal_i(3, free_count);
+
+	/* test what we loaded */
+
+	cl_assert_equal_sz(4, git_sortedcache_entrycount(sc));
+
+	cl_assert((item = git_sortedcache_lookup(sc, "abc")) != NULL);
+	cl_assert_equal_s("abc", item->path);
+	cl_assert_equal_i(100, item->value);
+	cl_assert((item = git_sortedcache_lookup(sc, "final")) != NULL);
+	cl_assert_equal_s("final", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert(git_sortedcache_lookup(sc, "cde") == NULL);
+
+	cl_assert((item = git_sortedcache_entry(sc, 0)) != NULL);
+	cl_assert_equal_s("aaa", item->path);
+	cl_assert_equal_i(500, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 2)) != NULL);
+	cl_assert_equal_s("final", item->path);
+	cl_assert_equal_i(10, item->value);
+	cl_assert((item = git_sortedcache_entry(sc, 3)) != NULL);
+	cl_assert_equal_s("zzz", item->path);
+	cl_assert_equal_i(200, item->value);
+
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "aaa"));
+	cl_assert_equal_sz(0, pos);
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "abc"));
+	cl_assert_equal_sz(1, pos);
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "final"));
+	cl_assert_equal_sz(2, pos);
+	cl_git_pass(git_sortedcache_lookup_index(&pos, sc, "zzz"));
+	cl_assert_equal_sz(3, pos);
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sortedcache_lookup_index(&pos, sc, "missing"));
+	cl_assert_equal_i(
+		GIT_ENOTFOUND, git_sortedcache_lookup_index(&pos, sc, "cde"));
+
+	git_sortedcache_free(sc);
+
+	cl_assert_equal_i(7, free_count);
+}
+
diff --git a/tests/libgit2/core/stat.c b/tests/libgit2/core/stat.c
new file mode 100644
index 000000000..210072fe3
--- /dev/null
+++ b/tests/libgit2/core/stat.c
@@ -0,0 +1,113 @@
+#include "clar_libgit2.h"
+#include "futils.h"
+#include "posix.h"
+
+void test_core_stat__initialize(void)
+{
+	cl_git_pass(git_futils_mkdir("root/d1/d2", 0755, GIT_MKDIR_PATH));
+	cl_git_mkfile("root/file", "whatever\n");
+	cl_git_mkfile("root/d1/file", "whatever\n");
+}
+
+void test_core_stat__cleanup(void)
+{
+	git_futils_rmdir_r("root", NULL, GIT_RMDIR_REMOVE_FILES);
+}
+
+#define cl_assert_error(val) \
+	do { err = errno; cl_assert_equal_i((val), err); } while (0)
+
+void test_core_stat__0(void)
+{
+	struct stat st;
+	int err;
+
+	cl_assert_equal_i(0, p_lstat("root", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+	cl_assert_error(0);
+
+	cl_assert_equal_i(0, p_lstat("root/", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+	cl_assert_error(0);
+
+	cl_assert_equal_i(0, p_lstat("root/file", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_error(0);
+
+	cl_assert_equal_i(0, p_lstat("root/d1", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+	cl_assert_error(0);
+
+	cl_assert_equal_i(0, p_lstat("root/d1/", &st));
+	cl_assert(S_ISDIR(st.st_mode));
+	cl_assert_error(0);
+
+	cl_assert_equal_i(0, p_lstat("root/d1/file", &st));
+	cl_assert(S_ISREG(st.st_mode));
+	cl_assert_error(0);
+
+	cl_assert(p_lstat("root/missing", &st) < 0);
+	cl_assert_error(ENOENT);
+
+	cl_assert(p_lstat("root/missing/but/could/be/created", &st) < 0);
+	cl_assert_error(ENOENT);
+
+	cl_assert(p_lstat_posixly("root/missing/but/could/be/created", &st) < 0);
+	cl_assert_error(ENOENT);
+
+	cl_assert(p_lstat("root/d1/missing", &st) < 0);
+	cl_assert_error(ENOENT);
+
+	cl_assert(p_lstat("root/d1/missing/deeper/path", &st) < 0);
+	cl_assert_error(ENOENT);
+
+	cl_assert(p_lstat_posixly("root/d1/missing/deeper/path", &st) < 0);
+	cl_assert_error(ENOENT);
+
+	cl_assert(p_lstat_posixly("root/d1/file/deeper/path", &st) < 0);
+	cl_assert_error(ENOTDIR);
+
+	cl_assert(p_lstat("root/file/invalid", &st) < 0);
+#ifdef GIT_WIN32
+	cl_assert_error(ENOENT);
+#else
+	cl_assert_error(ENOTDIR);
+#endif
+
+	cl_assert(p_lstat_posixly("root/file/invalid", &st) < 0);
+	cl_assert_error(ENOTDIR);
+
+	cl_assert(p_lstat("root/file/invalid/deeper_path", &st) < 0);
+#ifdef GIT_WIN32
+	cl_assert_error(ENOENT);
+#else
+	cl_assert_error(ENOTDIR);
+#endif
+
+	cl_assert(p_lstat_posixly("root/file/invalid/deeper_path", &st) < 0);
+	cl_assert_error(ENOTDIR);
+
+	cl_assert(p_lstat_posixly("root/d1/file/extra", &st) < 0);
+	cl_assert_error(ENOTDIR);
+
+	cl_assert(p_lstat_posixly("root/d1/file/further/invalid/items", &st) < 0);
+	cl_assert_error(ENOTDIR);
+}
+
+void test_core_stat__root(void)
+{
+	const char *sandbox = clar_sandbox_path();
+	git_str root = GIT_STR_INIT;
+	int root_len;
+	struct stat st;
+
+	root_len = git_fs_path_root(sandbox);
+	cl_assert(root_len >= 0);
+
+	git_str_set(&root, sandbox, root_len+1);
+
+	cl_must_pass(p_stat(root.ptr, &st));
+	cl_assert(S_ISDIR(st.st_mode));
+
+	git_str_dispose(&root);
+}
diff --git a/tests/libgit2/core/string.c b/tests/libgit2/core/string.c
new file mode 100644
index 000000000..928dfbcc1
--- /dev/null
+++ b/tests/libgit2/core/string.c
@@ -0,0 +1,136 @@
+#include "clar_libgit2.h"
+
+/* compare prefixes */
+void test_core_string__0(void)
+{
+	cl_assert(git__prefixcmp("", "") == 0);
+	cl_assert(git__prefixcmp("a", "") == 0);
+	cl_assert(git__prefixcmp("", "a") < 0);
+	cl_assert(git__prefixcmp("a", "b") < 0);
+	cl_assert(git__prefixcmp("b", "a") > 0);
+	cl_assert(git__prefixcmp("ab", "a") == 0);
+	cl_assert(git__prefixcmp("ab", "ac") < 0);
+	cl_assert(git__prefixcmp("ab", "aa") > 0);
+}
+
+/* compare suffixes */
+void test_core_string__1(void)
+{
+	cl_assert(git__suffixcmp("", "") == 0);
+	cl_assert(git__suffixcmp("a", "") == 0);
+	cl_assert(git__suffixcmp("", "a") < 0);
+	cl_assert(git__suffixcmp("a", "b") < 0);
+	cl_assert(git__suffixcmp("b", "a") > 0);
+	cl_assert(git__suffixcmp("ba", "a") == 0);
+	cl_assert(git__suffixcmp("zaa", "ac") < 0);
+	cl_assert(git__suffixcmp("zaz", "ac") > 0);
+}
+
+/* compare icase sorting with case equality */
+void test_core_string__2(void)
+{
+	cl_assert(git__strcasesort_cmp("", "") == 0);
+	cl_assert(git__strcasesort_cmp("foo", "foo") == 0);
+	cl_assert(git__strcasesort_cmp("foo", "bar") > 0);
+	cl_assert(git__strcasesort_cmp("bar", "foo") < 0);
+	cl_assert(git__strcasesort_cmp("foo", "FOO") > 0);
+	cl_assert(git__strcasesort_cmp("FOO", "foo") < 0);
+	cl_assert(git__strcasesort_cmp("foo", "BAR") > 0);
+	cl_assert(git__strcasesort_cmp("BAR", "foo") < 0);
+	cl_assert(git__strcasesort_cmp("fooBar", "foobar") < 0);
+}
+
+/* compare prefixes with len */
+void test_core_string__prefixncmp(void)
+{
+	cl_assert(git__prefixncmp("", 0, "") == 0);
+	cl_assert(git__prefixncmp("a", 1, "") == 0);
+	cl_assert(git__prefixncmp("", 0, "a") < 0);
+	cl_assert(git__prefixncmp("a", 1, "b") < 0);
+	cl_assert(git__prefixncmp("b", 1, "a") > 0);
+	cl_assert(git__prefixncmp("ab", 2, "a") == 0);
+	cl_assert(git__prefixncmp("ab", 1, "a") == 0);
+	cl_assert(git__prefixncmp("ab", 2, "ac") < 0);
+	cl_assert(git__prefixncmp("a", 1, "ac") < 0);
+	cl_assert(git__prefixncmp("ab", 1, "ac") < 0);
+	cl_assert(git__prefixncmp("ab", 2, "aa") > 0);
+	cl_assert(git__prefixncmp("ab", 1, "aa") < 0);
+}
+
+/* compare prefixes with len */
+void test_core_string__prefixncmp_icase(void)
+{
+	cl_assert(git__prefixncmp_icase("", 0, "") == 0);
+	cl_assert(git__prefixncmp_icase("a", 1, "") == 0);
+	cl_assert(git__prefixncmp_icase("", 0, "a") < 0);
+	cl_assert(git__prefixncmp_icase("a", 1, "b") < 0);
+	cl_assert(git__prefixncmp_icase("A", 1, "b") < 0);
+	cl_assert(git__prefixncmp_icase("a", 1, "B") < 0);
+	cl_assert(git__prefixncmp_icase("b", 1, "a") > 0);
+	cl_assert(git__prefixncmp_icase("B", 1, "a") > 0);
+	cl_assert(git__prefixncmp_icase("b", 1, "A") > 0);
+	cl_assert(git__prefixncmp_icase("ab", 2, "a") == 0);
+	cl_assert(git__prefixncmp_icase("Ab", 2, "a") == 0);
+	cl_assert(git__prefixncmp_icase("ab", 2, "A") == 0);
+	cl_assert(git__prefixncmp_icase("ab", 1, "a") == 0);
+	cl_assert(git__prefixncmp_icase("ab", 2, "ac") < 0);
+	cl_assert(git__prefixncmp_icase("Ab", 2, "ac") < 0);
+	cl_assert(git__prefixncmp_icase("ab", 2, "Ac") < 0);
+	cl_assert(git__prefixncmp_icase("a", 1, "ac") < 0);
+	cl_assert(git__prefixncmp_icase("ab", 1, "ac") < 0);
+	cl_assert(git__prefixncmp_icase("ab", 2, "aa") > 0);
+	cl_assert(git__prefixncmp_icase("ab", 1, "aa") < 0);
+}
+
+void test_core_string__strcmp(void)
+{
+	cl_assert(git__strcmp("", "") == 0);
+	cl_assert(git__strcmp("foo", "foo") == 0);
+	cl_assert(git__strcmp("Foo", "foo") < 0);
+	cl_assert(git__strcmp("foo", "FOO") > 0);
+	cl_assert(git__strcmp("foo", "fOO") > 0);
+
+	cl_assert(strcmp("rt\303\202of", "rt dev\302\266h") > 0);
+	cl_assert(strcmp("e\342\202\254ghi=", "et") > 0);
+	cl_assert(strcmp("rt dev\302\266h", "rt\303\202of") < 0);
+	cl_assert(strcmp("et", "e\342\202\254ghi=") < 0);
+	cl_assert(strcmp("\303\215", "\303\255") < 0);
+
+	cl_assert(git__strcmp("rt\303\202of", "rt dev\302\266h") > 0);
+	cl_assert(git__strcmp("e\342\202\254ghi=", "et") > 0);
+	cl_assert(git__strcmp("rt dev\302\266h", "rt\303\202of") < 0);
+	cl_assert(git__strcmp("et", "e\342\202\254ghi=") < 0);
+	cl_assert(git__strcmp("\303\215", "\303\255") < 0);
+}
+
+void test_core_string__strcasecmp(void)
+{
+	cl_assert(git__strcasecmp("", "") == 0);
+	cl_assert(git__strcasecmp("foo", "foo") == 0);
+	cl_assert(git__strcasecmp("foo", "Foo") == 0);
+	cl_assert(git__strcasecmp("foo", "FOO") == 0);
+	cl_assert(git__strcasecmp("foo", "fOO") == 0);
+
+	cl_assert(strcasecmp("rt\303\202of", "rt dev\302\266h") > 0);
+	cl_assert(strcasecmp("e\342\202\254ghi=", "et") > 0);
+	cl_assert(strcasecmp("rt dev\302\266h", "rt\303\202of") < 0);
+	cl_assert(strcasecmp("et", "e\342\202\254ghi=") < 0);
+	cl_assert(strcasecmp("\303\215", "\303\255") < 0);
+
+	cl_assert(git__strcasecmp("rt\303\202of", "rt dev\302\266h") > 0);
+	cl_assert(git__strcasecmp("e\342\202\254ghi=", "et") > 0);
+	cl_assert(git__strcasecmp("rt dev\302\266h", "rt\303\202of") < 0);
+	cl_assert(git__strcasecmp("et", "e\342\202\254ghi=") < 0);
+	cl_assert(git__strcasecmp("\303\215", "\303\255") < 0);
+}
+
+void test_core_string__strlcmp(void)
+{
+	const char foo[3] = { 'f', 'o', 'o' };
+
+	cl_assert(git__strlcmp("foo", "foo", 3) == 0);
+	cl_assert(git__strlcmp("foo", foo, 3) == 0);
+	cl_assert(git__strlcmp("foo", "foobar", 3) == 0);
+	cl_assert(git__strlcmp("foobar", "foo", 3) > 0);
+	cl_assert(git__strlcmp("foo", "foobar", 6) < 0);
+}
diff --git a/tests/libgit2/core/strmap.c b/tests/libgit2/core/strmap.c
new file mode 100644
index 000000000..ba118ae1e
--- /dev/null
+++ b/tests/libgit2/core/strmap.c
@@ -0,0 +1,190 @@
+#include "clar_libgit2.h"
+#include "strmap.h"
+
+static git_strmap *g_table;
+
+void test_core_strmap__initialize(void)
+{
+	cl_git_pass(git_strmap_new(&g_table));
+	cl_assert(g_table != NULL);
+}
+
+void test_core_strmap__cleanup(void)
+{
+	git_strmap_free(g_table);
+}
+
+void test_core_strmap__0(void)
+{
+	cl_assert(git_strmap_size(g_table) == 0);
+}
+
+static void insert_strings(git_strmap *table, size_t count)
+{
+	size_t i, j, over;
+	char *str;
+
+	for (i = 0; i < count; ++i) {
+		str = malloc(10);
+		for (j = 0; j < 10; ++j)
+			str[j] = 'a' + (i % 26);
+		str[9] = '\0';
+
+		/* if > 26, then encode larger value in first letters */
+		for (j = 0, over = i / 26; over > 0; j++, over = over / 26)
+			str[j] = 'A' + (over % 26);
+
+		cl_git_pass(git_strmap_set(table, str, str));
+	}
+
+	cl_assert_equal_i(git_strmap_size(table), count);
+}
+
+void test_core_strmap__inserted_strings_can_be_retrieved(void)
+{
+	char *str;
+	int i;
+
+	insert_strings(g_table, 20);
+
+	cl_assert(git_strmap_exists(g_table, "aaaaaaaaa"));
+	cl_assert(git_strmap_exists(g_table, "ggggggggg"));
+	cl_assert(!git_strmap_exists(g_table, "aaaaaaaab"));
+	cl_assert(!git_strmap_exists(g_table, "abcdefghi"));
+
+	i = 0;
+	git_strmap_foreach_value(g_table, str, { i++; free(str); });
+	cl_assert(i == 20);
+}
+
+void test_core_strmap__deleted_entry_cannot_be_retrieved(void)
+{
+	char *str;
+	int i;
+
+	insert_strings(g_table, 20);
+
+	cl_assert(git_strmap_exists(g_table, "bbbbbbbbb"));
+	str = git_strmap_get(g_table, "bbbbbbbbb");
+	cl_assert_equal_s(str, "bbbbbbbbb");
+	cl_git_pass(git_strmap_delete(g_table, "bbbbbbbbb"));
+	free(str);
+
+	cl_assert(!git_strmap_exists(g_table, "bbbbbbbbb"));
+
+	i = 0;
+	git_strmap_foreach_value(g_table, str, { i++; free(str); });
+	cl_assert_equal_i(i, 19);
+}
+
+void test_core_strmap__inserting_many_keys_succeeds(void)
+{
+	char *str;
+	int i;
+
+	insert_strings(g_table, 10000);
+
+	i = 0;
+	git_strmap_foreach_value(g_table, str, { i++; free(str); });
+	cl_assert_equal_i(i, 10000);
+}
+
+void test_core_strmap__get_succeeds_with_existing_entries(void)
+{
+	const char *keys[] = { "foo", "bar", "gobble" };
+	char *values[] = { "oof", "rab", "elbbog" };
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(keys); i++)
+		cl_git_pass(git_strmap_set(g_table, keys[i], values[i]));
+
+	cl_assert_equal_s(git_strmap_get(g_table, "foo"), "oof");
+	cl_assert_equal_s(git_strmap_get(g_table, "bar"), "rab");
+	cl_assert_equal_s(git_strmap_get(g_table, "gobble"), "elbbog");
+}
+
+void test_core_strmap__get_returns_null_on_nonexisting_key(void)
+{
+	const char *keys[] = { "foo", "bar", "gobble" };
+	char *values[] = { "oof", "rab", "elbbog" };
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(keys); i++)
+		cl_git_pass(git_strmap_set(g_table, keys[i], values[i]));
+
+	cl_assert_equal_p(git_strmap_get(g_table, "other"), NULL);
+}
+
+void test_core_strmap__set_persists_key(void)
+{
+	cl_git_pass(git_strmap_set(g_table, "foo", "oof"));
+	cl_assert_equal_s(git_strmap_get(g_table, "foo"), "oof");
+}
+
+void test_core_strmap__set_persists_multpile_keys(void)
+{
+	cl_git_pass(git_strmap_set(g_table, "foo", "oof"));
+	cl_git_pass(git_strmap_set(g_table, "bar", "rab"));
+	cl_assert_equal_s(git_strmap_get(g_table, "foo"), "oof");
+	cl_assert_equal_s(git_strmap_get(g_table, "bar"), "rab");
+}
+
+void test_core_strmap__set_updates_existing_key(void)
+{
+	cl_git_pass(git_strmap_set(g_table, "foo", "oof"));
+	cl_git_pass(git_strmap_set(g_table, "bar", "rab"));
+	cl_git_pass(git_strmap_set(g_table, "gobble", "elbbog"));
+	cl_assert_equal_i(git_strmap_size(g_table), 3);
+
+	cl_git_pass(git_strmap_set(g_table, "foo", "other"));
+	cl_assert_equal_i(git_strmap_size(g_table), 3);
+
+	cl_assert_equal_s(git_strmap_get(g_table, "foo"), "other");
+}
+
+void test_core_strmap__iteration(void)
+{
+	struct {
+		char *key;
+		char *value;
+		int seen;
+	} entries[] = {
+		{ "foo", "oof" },
+		{ "bar", "rab" },
+		{ "gobble", "elbbog" },
+	};
+	const char *key, *value;
+	size_t i, n;
+
+	for (i = 0; i < ARRAY_SIZE(entries); i++)
+		cl_git_pass(git_strmap_set(g_table, entries[i].key, entries[i].value));
+
+	i = 0, n = 0;
+	while (git_strmap_iterate((void **) &value, g_table, &i, &key) == 0) {
+		size_t j;
+
+		for (j = 0; j < ARRAY_SIZE(entries); j++) {
+			if (strcmp(entries[j].key, key))
+				continue;
+
+			cl_assert_equal_i(entries[j].seen, 0);
+			cl_assert_equal_s(entries[j].value, value);
+			entries[j].seen++;
+			break;
+		}
+
+		n++;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(entries); i++)
+		cl_assert_equal_i(entries[i].seen, 1);
+
+	cl_assert_equal_i(n, ARRAY_SIZE(entries));
+}
+
+void test_core_strmap__iterating_empty_map_stops_immediately(void)
+{
+	size_t i = 0;
+
+	cl_git_fail_with(git_strmap_iterate(NULL, g_table, &i, NULL), GIT_ITEROVER);
+}
diff --git a/tests/libgit2/core/strtol.c b/tests/libgit2/core/strtol.c
new file mode 100644
index 000000000..851b91b0a
--- /dev/null
+++ b/tests/libgit2/core/strtol.c
@@ -0,0 +1,128 @@
+#include "clar_libgit2.h"
+
+static void assert_l32_parses(const char *string, int32_t expected, int base)
+{
+	int32_t i;
+	cl_git_pass(git__strntol32(&i, string, strlen(string), NULL, base));
+	cl_assert_equal_i(i, expected);
+}
+
+static void assert_l32_fails(const char *string, int base)
+{
+	int32_t i;
+	cl_git_fail(git__strntol32(&i, string, strlen(string), NULL, base));
+}
+
+static void assert_l64_parses(const char *string, int64_t expected, int base)
+{
+	int64_t i;
+	cl_git_pass(git__strntol64(&i, string, strlen(string), NULL, base));
+	cl_assert_equal_i(i, expected);
+}
+
+static void assert_l64_fails(const char *string, int base)
+{
+	int64_t i;
+	cl_git_fail(git__strntol64(&i, string, strlen(string), NULL, base));
+}
+
+void test_core_strtol__int32(void)
+{
+	assert_l32_parses("123", 123, 10);
+	assert_l32_parses("  +123 ", 123, 10);
+	assert_l32_parses("  -123 ", -123, 10);
+	assert_l32_parses("  +2147483647 ", 2147483647, 10);
+	assert_l32_parses("  -2147483648 ", INT64_C(-2147483648), 10);
+	assert_l32_parses("A", 10, 16);
+	assert_l32_parses("1x1", 1, 10);
+
+	assert_l32_fails("", 10);
+	assert_l32_fails("a", 10);
+	assert_l32_fails("x10x", 10);
+	assert_l32_fails("  2147483657 ", 10);
+	assert_l32_fails("  -2147483657 ", 10);
+}
+
+void test_core_strtol__int64(void)
+{
+	assert_l64_parses("123", 123, 10);
+	assert_l64_parses("  +123 ", 123, 10);
+	assert_l64_parses("  -123 ", -123, 10);
+	assert_l64_parses("  +2147483647 ", 2147483647, 10);
+	assert_l64_parses("  -2147483648 ", INT64_C(-2147483648), 10);
+	assert_l64_parses("  2147483657 ", INT64_C(2147483657), 10);
+	assert_l64_parses("  -2147483657 ", INT64_C(-2147483657), 10);
+	assert_l64_parses(" 9223372036854775807  ", INT64_MAX, 10);
+	assert_l64_parses("   -9223372036854775808  ", INT64_MIN, 10);
+	assert_l64_parses("   0x7fffffffffffffff  ", INT64_MAX, 16);
+	assert_l64_parses("   -0x8000000000000000   ", INT64_MIN, 16);
+	assert_l64_parses("1a", 26, 16);
+	assert_l64_parses("1A", 26, 16);
+
+	assert_l64_fails("", 10);
+	assert_l64_fails("a", 10);
+	assert_l64_fails("x10x", 10);
+	assert_l64_fails("0x8000000000000000", 16);
+	assert_l64_fails("-0x8000000000000001", 16);
+}
+
+void test_core_strtol__base_autodetection(void)
+{
+	assert_l64_parses("0", 0, 0);
+	assert_l64_parses("00", 0, 0);
+	assert_l64_parses("0x", 0, 0);
+	assert_l64_parses("0foobar", 0, 0);
+	assert_l64_parses("07", 7, 0);
+	assert_l64_parses("017", 15, 0);
+	assert_l64_parses("0x8", 8, 0);
+	assert_l64_parses("0x18", 24, 0);
+}
+
+void test_core_strtol__buffer_length_with_autodetection_truncates(void)
+{
+	int64_t i64;
+
+	cl_git_pass(git__strntol64(&i64, "011", 2, NULL, 0));
+	cl_assert_equal_i(i64, 1);
+	cl_git_pass(git__strntol64(&i64, "0x11", 3, NULL, 0));
+	cl_assert_equal_i(i64, 1);
+}
+
+void test_core_strtol__buffer_length_truncates(void)
+{
+	int32_t i32;
+	int64_t i64;
+
+	cl_git_pass(git__strntol32(&i32, "11", 1, NULL, 10));
+	cl_assert_equal_i(i32, 1);
+
+	cl_git_pass(git__strntol64(&i64, "11", 1, NULL, 10));
+	cl_assert_equal_i(i64, 1);
+}
+
+void test_core_strtol__buffer_length_with_leading_ws_truncates(void)
+{
+	int64_t i64;
+
+	cl_git_fail(git__strntol64(&i64, " 1", 1, NULL, 10));
+
+	cl_git_pass(git__strntol64(&i64, " 11", 2, NULL, 10));
+	cl_assert_equal_i(i64, 1);
+}
+
+void test_core_strtol__buffer_length_with_leading_sign_truncates(void)
+{
+	int64_t i64;
+
+	cl_git_fail(git__strntol64(&i64, "-1", 1, NULL, 10));
+
+	cl_git_pass(git__strntol64(&i64, "-11", 2, NULL, 10));
+	cl_assert_equal_i(i64, -1);
+}
+
+void test_core_strtol__error_message_cuts_off(void)
+{
+	assert_l32_fails("2147483657foobar", 10);
+	cl_assert(strstr(git_error_last()->message, "2147483657") != NULL);
+	cl_assert(strstr(git_error_last()->message, "foobar") == NULL);
+}
diff --git a/tests/libgit2/core/structinit.c b/tests/libgit2/core/structinit.c
new file mode 100644
index 000000000..160e2f612
--- /dev/null
+++ b/tests/libgit2/core/structinit.c
@@ -0,0 +1,201 @@
+#include "clar_libgit2.h"
+#include <git2/sys/commit_graph.h>
+#include <git2/sys/config.h>
+#include <git2/sys/filter.h>
+#include <git2/sys/odb_backend.h>
+#include <git2/sys/refdb_backend.h>
+#include <git2/sys/transport.h>
+
+#define STRINGIFY(s) #s
+
+/* Checks two conditions for the specified structure:
+ *     1. That the initializers for the latest version produces the same
+ *        in-memory representation.
+ *     2. That the function-based initializer supports all versions from 1...n,
+ *        where n is the latest version (often represented by GIT_*_VERSION).
+ *
+ * Parameters:
+ *     structname: The name of the structure to test, e.g. git_blame_options.
+ *     structver: The latest version of the specified structure.
+ *     macroinit: The macro that initializes the latest version of the structure.
+ *     funcinitname: The function that initializes the structure. Must have the
+ *                   signature "int (structname* instance, int version)".
+ */
+#define CHECK_MACRO_FUNC_INIT_EQUAL(structname, structver, macroinit, funcinitname) \
+do { \
+	structname structname##_macro_latest = macroinit; \
+	structname structname##_func_latest; \
+	int structname##_curr_ver = structver - 1; \
+	memset(&structname##_func_latest, 0, sizeof(structname##_func_latest)); \
+	cl_git_pass(funcinitname(&structname##_func_latest, structver)); \
+	options_cmp(&structname##_macro_latest, &structname##_func_latest, \
+		sizeof(structname), STRINGIFY(structname)); \
+	\
+	while (structname##_curr_ver > 0) \
+	{ \
+		structname macro; \
+		cl_git_pass(funcinitname(&macro, structname##_curr_ver)); \
+		structname##_curr_ver--; \
+	}\
+} while(0)
+
+static void options_cmp(void *one, void *two, size_t size, const char *name)
+{
+	size_t i;
+
+	for (i = 0; i < size; i++) {
+		if (((char *)one)[i] != ((char *)two)[i]) {
+			char desc[1024];
+
+			p_snprintf(desc, 1024, "Difference in %s at byte %" PRIuZ ": macro=%u / func=%u",
+				name, i, ((char *)one)[i], ((char *)two)[i]);
+			clar__fail(__FILE__, __func__, __LINE__,
+				"Difference between macro and function options initializer",
+				desc, 0);
+			return;
+		}
+	}
+}
+
+void test_core_structinit__compare(void)
+{
+	/* These tests assume that they can memcmp() two structures that were
+	 * initialized with the same static initializer.  Eg,
+	 * git_blame_options = GIT_BLAME_OPTIONS_INIT;
+	 *
+	 * This assumption fails when there is padding between structure members,
+	 * which is not guaranteed to be initialized to anything sane at all.
+	 *
+	 * Assume most compilers, in a debug build, will clear that memory for
+	 * us or set it to sentinel markers.  Etc.
+	 */
+#if !defined(DEBUG) && !defined(_DEBUG)
+	clar__skip();
+#endif
+
+	/* apply */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_apply_options, GIT_APPLY_OPTIONS_VERSION, \
+		GIT_APPLY_OPTIONS_INIT, git_apply_options_init);
+
+	/* blame */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_blame_options, GIT_BLAME_OPTIONS_VERSION, \
+		GIT_BLAME_OPTIONS_INIT, git_blame_options_init);
+
+	/* blob_filter_options */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_blob_filter_options, GIT_BLOB_FILTER_OPTIONS_VERSION, \
+		GIT_BLOB_FILTER_OPTIONS_INIT, git_blob_filter_options_init);
+
+	/* checkout */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_checkout_options, GIT_CHECKOUT_OPTIONS_VERSION, \
+		GIT_CHECKOUT_OPTIONS_INIT, git_checkout_options_init);
+
+	/* clone */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_clone_options, GIT_CLONE_OPTIONS_VERSION, \
+		GIT_CLONE_OPTIONS_INIT, git_clone_options_init);
+
+	/* commit_graph_writer */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_commit_graph_writer_options, \
+		GIT_COMMIT_GRAPH_WRITER_OPTIONS_VERSION, \
+		GIT_COMMIT_GRAPH_WRITER_OPTIONS_INIT, \
+		git_commit_graph_writer_options_init);
+
+	/* diff */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_diff_options, GIT_DIFF_OPTIONS_VERSION, \
+		GIT_DIFF_OPTIONS_INIT, git_diff_options_init);
+
+	/* diff_find */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_diff_find_options, GIT_DIFF_FIND_OPTIONS_VERSION, \
+		GIT_DIFF_FIND_OPTIONS_INIT, git_diff_find_options_init);
+
+	/* filter */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_filter, GIT_FILTER_VERSION, \
+		GIT_FILTER_INIT, git_filter_init);
+
+	/* merge_file_input */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_merge_file_input, GIT_MERGE_FILE_INPUT_VERSION, \
+		GIT_MERGE_FILE_INPUT_INIT, git_merge_file_input_init);
+
+	/* merge_file */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_merge_file_options, GIT_MERGE_FILE_OPTIONS_VERSION, \
+		GIT_MERGE_FILE_OPTIONS_INIT, git_merge_file_options_init);
+
+	/* merge_tree */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_merge_options, GIT_MERGE_OPTIONS_VERSION, \
+		GIT_MERGE_OPTIONS_INIT, git_merge_options_init);
+
+	/* push */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_push_options, GIT_PUSH_OPTIONS_VERSION, \
+		GIT_PUSH_OPTIONS_INIT, git_push_options_init);
+
+	/* remote */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_remote_callbacks, GIT_REMOTE_CALLBACKS_VERSION, \
+		GIT_REMOTE_CALLBACKS_INIT, git_remote_init_callbacks);
+
+	/* repository_init */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_repository_init_options, GIT_REPOSITORY_INIT_OPTIONS_VERSION, \
+		GIT_REPOSITORY_INIT_OPTIONS_INIT, git_repository_init_options_init);
+
+	/* revert */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_revert_options, GIT_REVERT_OPTIONS_VERSION, \
+		GIT_REVERT_OPTIONS_INIT, git_revert_options_init);
+
+	/* stash apply */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_stash_apply_options, GIT_STASH_APPLY_OPTIONS_VERSION, \
+		GIT_STASH_APPLY_OPTIONS_INIT, git_stash_apply_options_init);
+
+	/* status */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_status_options, GIT_STATUS_OPTIONS_VERSION, \
+		GIT_STATUS_OPTIONS_INIT, git_status_options_init);
+
+	/* transport */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_transport, GIT_TRANSPORT_VERSION, \
+		GIT_TRANSPORT_INIT, git_transport_init);
+
+	/* config_backend */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_config_backend, GIT_CONFIG_BACKEND_VERSION, \
+		GIT_CONFIG_BACKEND_INIT, git_config_init_backend);
+
+	/* odb_backend */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_odb_backend, GIT_ODB_BACKEND_VERSION, \
+		GIT_ODB_BACKEND_INIT, git_odb_init_backend);
+
+	/* refdb_backend */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_refdb_backend, GIT_REFDB_BACKEND_VERSION, \
+		GIT_REFDB_BACKEND_INIT, git_refdb_init_backend);
+
+	/* submodule update */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_submodule_update_options, GIT_SUBMODULE_UPDATE_OPTIONS_VERSION, \
+		GIT_SUBMODULE_UPDATE_OPTIONS_INIT, git_submodule_update_options_init);
+
+	/* submodule update */
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_proxy_options, GIT_PROXY_OPTIONS_VERSION, \
+		GIT_PROXY_OPTIONS_INIT, git_proxy_options_init);
+
+	CHECK_MACRO_FUNC_INIT_EQUAL( \
+		git_diff_patchid_options, GIT_DIFF_PATCHID_OPTIONS_VERSION, \
+		GIT_DIFF_PATCHID_OPTIONS_INIT, git_diff_patchid_options_init);
+}
diff --git a/tests/libgit2/core/useragent.c b/tests/libgit2/core/useragent.c
new file mode 100644
index 000000000..a4ece902f
--- /dev/null
+++ b/tests/libgit2/core/useragent.c
@@ -0,0 +1,17 @@
+#include "clar_libgit2.h"
+#include "settings.h"
+
+void test_core_useragent__get(void)
+{
+	const char *custom_name = "super duper git";
+	git_str buf = GIT_STR_INIT;
+
+	cl_assert_equal_p(NULL, git_libgit2__user_agent());
+	cl_git_pass(git_libgit2_opts(GIT_OPT_SET_USER_AGENT, custom_name));
+	cl_assert_equal_s(custom_name, git_libgit2__user_agent());
+
+	cl_git_pass(git_libgit2_opts(GIT_OPT_GET_USER_AGENT, &buf));
+	cl_assert_equal_s(custom_name, buf.ptr);
+
+	git_str_dispose(&buf);
+}
diff --git a/tests/libgit2/core/utf8.c b/tests/libgit2/core/utf8.c
new file mode 100644
index 000000000..e1987b8d6
--- /dev/null
+++ b/tests/libgit2/core/utf8.c
@@ -0,0 +1,20 @@
+#include "clar_libgit2.h"
+#include "utf8.h"
+
+void test_core_utf8__char_length(void)
+{
+	cl_assert_equal_i(0, git_utf8_char_length("", 0));
+	cl_assert_equal_i(1, git_utf8_char_length("$", 1));
+	cl_assert_equal_i(5, git_utf8_char_length("abcde", 5));
+	cl_assert_equal_i(1, git_utf8_char_length("\xc2\xa2", 2));
+	cl_assert_equal_i(2, git_utf8_char_length("\x24\xc2\xa2", 3));
+	cl_assert_equal_i(1, git_utf8_char_length("\xf0\x90\x8d\x88", 4));
+
+	/* uncontinued character counted as single characters */
+	cl_assert_equal_i(2, git_utf8_char_length("\x24\xc2", 2));
+	cl_assert_equal_i(3, git_utf8_char_length("\x24\xc2\xc2\xa2", 4));
+
+	/* invalid characters are counted as single characters */
+	cl_assert_equal_i(4, git_utf8_char_length("\x24\xc0\xc0\x34", 4));
+	cl_assert_equal_i(4, git_utf8_char_length("\x24\xf5\xfd\xc2", 4));
+}
diff --git a/tests/libgit2/core/vector.c b/tests/libgit2/core/vector.c
new file mode 100644
index 000000000..08cd2c19b
--- /dev/null
+++ b/tests/libgit2/core/vector.c
@@ -0,0 +1,430 @@
+#include <stdint.h>
+
+#include "clar_libgit2.h"
+#include "vector.h"
+
+/* initial size of 1 would cause writing past array bounds */
+void test_core_vector__0(void)
+{
+	git_vector x;
+	int i;
+	cl_git_pass(git_vector_init(&x, 1, NULL));
+	for (i = 0; i < 10; ++i) {
+		git_vector_insert(&x, (void*) 0xabc);
+	}
+	git_vector_free(&x);
+}
+
+
+/* don't read past array bounds on remove() */
+void test_core_vector__1(void)
+{
+	git_vector x;
+	/* make initial capacity exact for our insertions. */
+	cl_git_pass(git_vector_init(&x, 3, NULL));
+	git_vector_insert(&x, (void*) 0xabc);
+	git_vector_insert(&x, (void*) 0xdef);
+	git_vector_insert(&x, (void*) 0x123);
+
+	git_vector_remove(&x, 0); /* used to read past array bounds. */
+	git_vector_free(&x);
+}
+
+
+static int test_cmp(const void *a, const void *b)
+{
+	return *(const int *)a - *(const int *)b;
+}
+
+/* remove duplicates */
+void test_core_vector__2(void)
+{
+	git_vector x;
+	int *ptrs[2];
+
+	ptrs[0] = git__malloc(sizeof(int));
+	ptrs[1] = git__malloc(sizeof(int));
+
+	*ptrs[0] = 2;
+	*ptrs[1] = 1;
+
+	cl_git_pass(git_vector_init(&x, 5, test_cmp));
+	cl_git_pass(git_vector_insert(&x, ptrs[0]));
+	cl_git_pass(git_vector_insert(&x, ptrs[1]));
+	cl_git_pass(git_vector_insert(&x, ptrs[1]));
+	cl_git_pass(git_vector_insert(&x, ptrs[0]));
+	cl_git_pass(git_vector_insert(&x, ptrs[1]));
+	cl_assert(x.length == 5);
+
+	git_vector_uniq(&x, NULL);
+	cl_assert(x.length == 2);
+
+	git_vector_free(&x);
+
+	git__free(ptrs[0]);
+	git__free(ptrs[1]);
+}
+
+
+static int compare_them(const void *a, const void *b)
+{
+	return (int)((intptr_t)a - (intptr_t)b);
+}
+
+/* insert_sorted */
+void test_core_vector__3(void)
+{
+	git_vector x;
+	intptr_t i;
+	cl_git_pass(git_vector_init(&x, 1, &compare_them));
+
+	for (i = 0; i < 10; i += 2) {
+		git_vector_insert_sorted(&x, (void*)(i + 1), NULL);
+	}
+
+	for (i = 9; i > 0; i -= 2) {
+		git_vector_insert_sorted(&x, (void*)(i + 1), NULL);
+	}
+
+	cl_assert(x.length == 10);
+	for (i = 0; i < 10; ++i) {
+		cl_assert(git_vector_get(&x, i) == (void*)(i + 1));
+	}
+
+	git_vector_free(&x);
+}
+
+/* insert_sorted with duplicates */
+void test_core_vector__4(void)
+{
+	git_vector x;
+	intptr_t i;
+	cl_git_pass(git_vector_init(&x, 1, &compare_them));
+
+	for (i = 0; i < 10; i += 2) {
+		git_vector_insert_sorted(&x, (void*)(i + 1), NULL);
+	}
+
+	for (i = 9; i > 0; i -= 2) {
+		git_vector_insert_sorted(&x, (void*)(i + 1), NULL);
+	}
+
+	for (i = 0; i < 10; i += 2) {
+		git_vector_insert_sorted(&x, (void*)(i + 1), NULL);
+	}
+
+	for (i = 9; i > 0; i -= 2) {
+		git_vector_insert_sorted(&x, (void*)(i + 1), NULL);
+	}
+
+	cl_assert(x.length == 20);
+	for (i = 0; i < 20; ++i) {
+		cl_assert(git_vector_get(&x, i) == (void*)(i / 2 + 1));
+	}
+
+	git_vector_free(&x);
+}
+
+typedef struct {
+	int content;
+	int count;
+} my_struct;
+
+static int _struct_count = 0;
+
+static int compare_structs(const void *a, const void *b)
+{
+	return ((const my_struct *)a)->content -
+		((const my_struct *)b)->content;
+}
+
+static int merge_structs(void **old_raw, void *new)
+{
+	my_struct *old = *(my_struct **)old_raw;
+	cl_assert(((my_struct *)old)->content == ((my_struct *)new)->content);
+	((my_struct *)old)->count += 1;
+	git__free(new);
+	_struct_count--;
+	return GIT_EEXISTS;
+}
+
+static my_struct *alloc_struct(int value)
+{
+	my_struct *st = git__malloc(sizeof(my_struct));
+	st->content = value;
+	st->count = 0;
+	_struct_count++;
+	return st;
+}
+
+/* insert_sorted with duplicates and special handling */
+void test_core_vector__5(void)
+{
+	git_vector x;
+	int i;
+
+	cl_git_pass(git_vector_init(&x, 1, &compare_structs));
+
+	for (i = 0; i < 10; i += 2)
+		git_vector_insert_sorted(&x, alloc_struct(i), &merge_structs);
+
+	for (i = 9; i > 0; i -= 2)
+		git_vector_insert_sorted(&x, alloc_struct(i), &merge_structs);
+
+	cl_assert(x.length == 10);
+	cl_assert(_struct_count == 10);
+
+	for (i = 0; i < 10; i += 2)
+		git_vector_insert_sorted(&x, alloc_struct(i), &merge_structs);
+
+	for (i = 9; i > 0; i -= 2)
+		git_vector_insert_sorted(&x, alloc_struct(i), &merge_structs);
+
+	cl_assert(x.length == 10);
+	cl_assert(_struct_count == 10);
+
+	for (i = 0; i < 10; ++i) {
+		cl_assert(((my_struct *)git_vector_get(&x, i))->content == i);
+		git__free(git_vector_get(&x, i));
+		_struct_count--;
+	}
+
+	git_vector_free(&x);
+}
+
+static int remove_ones(const git_vector *v, size_t idx, void *p)
+{
+	GIT_UNUSED(p);
+	return (git_vector_get(v, idx) == (void *)0x001);
+}
+
+/* Test removal based on callback */
+void test_core_vector__remove_matching(void)
+{
+	git_vector x;
+	size_t i;
+	void *compare;
+
+	cl_git_pass(git_vector_init(&x, 1, NULL));
+	git_vector_insert(&x, (void*) 0x001);
+
+	cl_assert(x.length == 1);
+	git_vector_remove_matching(&x, remove_ones, NULL);
+	cl_assert(x.length == 0);
+
+	git_vector_insert(&x, (void*) 0x001);
+	git_vector_insert(&x, (void*) 0x001);
+	git_vector_insert(&x, (void*) 0x001);
+
+	cl_assert(x.length == 3);
+	git_vector_remove_matching(&x, remove_ones, NULL);
+	cl_assert(x.length == 0);
+
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x001);
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x001);
+
+	cl_assert(x.length == 4);
+	git_vector_remove_matching(&x, remove_ones, NULL);
+	cl_assert(x.length == 2);
+
+	git_vector_foreach(&x, i, compare) {
+		cl_assert(compare != (void *)0x001);
+	}
+
+	git_vector_clear(&x);
+
+	git_vector_insert(&x, (void*) 0x001);
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x001);
+
+	cl_assert(x.length == 4);
+	git_vector_remove_matching(&x, remove_ones, NULL);
+	cl_assert(x.length == 2);
+
+	git_vector_foreach(&x, i, compare) {
+		cl_assert(compare != (void *)0x001);
+	}
+
+	git_vector_clear(&x);
+
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x001);
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x001);
+
+	cl_assert(x.length == 4);
+	git_vector_remove_matching(&x, remove_ones, NULL);
+	cl_assert(x.length == 2);
+
+	git_vector_foreach(&x, i, compare) {
+		cl_assert(compare != (void *)0x001);
+	}
+
+	git_vector_clear(&x);
+
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x003);
+	git_vector_insert(&x, (void*) 0x002);
+	git_vector_insert(&x, (void*) 0x003);
+
+	cl_assert(x.length == 4);
+	git_vector_remove_matching(&x, remove_ones, NULL);
+	cl_assert(x.length == 4);
+
+	git_vector_free(&x);
+}
+
+static void assert_vector(git_vector *x, void *expected[], size_t len)
+{
+	size_t i;
+
+	cl_assert_equal_i(len, x->length);
+
+	for (i = 0; i < len; i++)
+		cl_assert(expected[i] == x->contents[i]);
+}
+
+void test_core_vector__grow_and_shrink(void)
+{
+	git_vector x = GIT_VECTOR_INIT;
+	void *expected1[] = {
+		(void *)0x02, (void *)0x03, (void *)0x04, (void *)0x05,
+		(void *)0x06, (void *)0x07, (void *)0x08, (void *)0x09,
+		(void *)0x0a
+	};
+	void *expected2[] = {
+		(void *)0x02, (void *)0x04, (void *)0x05, (void *)0x06,
+		(void *)0x07, (void *)0x08, (void *)0x09, (void *)0x0a
+	};
+	void *expected3[] = {
+		(void *)0x02, (void *)0x04, (void *)0x05, (void *)0x06,
+		(void *)0x0a
+	};
+	void *expected4[] = {
+		(void *)0x02, (void *)0x04, (void *)0x05
+	};
+	void *expected5[] = {
+		(void *)0x00, (void *)0x00, (void *)0x02, (void *)0x04,
+		(void *)0x05
+	};
+	void *expected6[] = {
+		(void *)0x00, (void *)0x00, (void *)0x02, (void *)0x04,
+		(void *)0x05, (void *)0x00
+	};
+	void *expected7[] = {
+		(void *)0x00, (void *)0x00, (void *)0x02, (void *)0x04,
+		(void *)0x00, (void *)0x00, (void *)0x00, (void *)0x05,
+		(void *)0x00
+	};
+	void *expected8[] = {
+		(void *)0x04, (void *)0x00, (void *)0x00, (void *)0x00,
+		(void *)0x05, (void *)0x00
+	};
+	void *expected9[] = {
+		(void *)0x04, (void *)0x00, (void *)0x05, (void *)0x00
+	};
+	void *expectedA[] = { (void *)0x04, (void *)0x00 };
+	void *expectedB[] = { (void *)0x04 };
+
+	git_vector_insert(&x, (void *)0x01);
+	git_vector_insert(&x, (void *)0x02);
+	git_vector_insert(&x, (void *)0x03);
+	git_vector_insert(&x, (void *)0x04);
+	git_vector_insert(&x, (void *)0x05);
+	git_vector_insert(&x, (void *)0x06);
+	git_vector_insert(&x, (void *)0x07);
+	git_vector_insert(&x, (void *)0x08);
+	git_vector_insert(&x, (void *)0x09);
+	git_vector_insert(&x, (void *)0x0a);
+
+	git_vector_remove_range(&x, 0, 1);
+	assert_vector(&x, expected1, ARRAY_SIZE(expected1));
+
+	git_vector_remove_range(&x, 1, 1);
+	assert_vector(&x, expected2, ARRAY_SIZE(expected2));
+
+	git_vector_remove_range(&x, 4, 3);
+	assert_vector(&x, expected3, ARRAY_SIZE(expected3));
+
+	git_vector_remove_range(&x, 3, 2);
+	assert_vector(&x, expected4, ARRAY_SIZE(expected4));
+
+	git_vector_insert_null(&x, 0, 2);
+	assert_vector(&x, expected5, ARRAY_SIZE(expected5));
+
+	git_vector_insert_null(&x, 5, 1);
+	assert_vector(&x, expected6, ARRAY_SIZE(expected6));
+
+	git_vector_insert_null(&x, 4, 3);
+	assert_vector(&x, expected7, ARRAY_SIZE(expected7));
+
+	git_vector_remove_range(&x, 0, 3);
+	assert_vector(&x, expected8, ARRAY_SIZE(expected8));
+
+	git_vector_remove_range(&x, 1, 2);
+	assert_vector(&x, expected9, ARRAY_SIZE(expected9));
+
+	git_vector_remove_range(&x, 2, 2);
+	assert_vector(&x, expectedA, ARRAY_SIZE(expectedA));
+
+	git_vector_remove_range(&x, 1, 1);
+	assert_vector(&x, expectedB, ARRAY_SIZE(expectedB));
+
+	git_vector_remove_range(&x, 0, 1);
+	assert_vector(&x, NULL, 0);
+
+	git_vector_free(&x);
+}
+
+void test_core_vector__reverse(void)
+{
+	git_vector v = GIT_VECTOR_INIT;
+	size_t i;
+
+	void *in1[] = {(void *) 0x0, (void *) 0x1, (void *) 0x2, (void *) 0x3};
+	void *out1[] = {(void *) 0x3, (void *) 0x2, (void *) 0x1, (void *) 0x0};
+
+	void *in2[] = {(void *) 0x0, (void *) 0x1, (void *) 0x2, (void *) 0x3, (void *) 0x4};
+	void *out2[] = {(void *) 0x4, (void *) 0x3, (void *) 0x2, (void *) 0x1, (void *) 0x0};
+
+	for (i = 0; i < 4; i++)
+		cl_git_pass(git_vector_insert(&v, in1[i]));
+
+	git_vector_reverse(&v);
+
+	for (i = 0; i < 4; i++)
+		cl_assert_equal_p(out1[i], git_vector_get(&v, i));
+
+	git_vector_clear(&v);
+	for (i = 0; i < 5; i++)
+		cl_git_pass(git_vector_insert(&v, in2[i]));
+
+	git_vector_reverse(&v);
+
+	for (i = 0; i < 5; i++)
+		cl_assert_equal_p(out2[i], git_vector_get(&v, i));
+
+	git_vector_free(&v);
+}
+
+void test_core_vector__dup_empty_vector(void)
+{
+	git_vector v = GIT_VECTOR_INIT;
+	git_vector dup = GIT_VECTOR_INIT;
+	int dummy;
+
+	cl_assert_equal_i(0, v.length);
+
+	cl_git_pass(git_vector_dup(&dup, &v, v._cmp));
+	cl_assert_equal_i(0, dup._alloc_size);
+	cl_assert_equal_i(0, dup.length);
+
+	cl_git_pass(git_vector_insert(&dup, &dummy));
+	cl_assert_equal_i(8, dup._alloc_size);
+	cl_assert_equal_i(1, dup.length);
+
+	git_vector_free(&dup);
+}
diff --git a/tests/libgit2/core/wildmatch.c b/tests/libgit2/core/wildmatch.c
new file mode 100644
index 000000000..7c56ee7b8
--- /dev/null
+++ b/tests/libgit2/core/wildmatch.c
@@ -0,0 +1,248 @@
+#include "clar_libgit2.h"
+
+#include "wildmatch.h"
+
+#define assert_matches(string, pattern, wildmatch, iwildmatch, pathmatch, ipathmatch) \
+	assert_matches_(string, pattern, wildmatch, iwildmatch, pathmatch, ipathmatch, __FILE__, __func__, __LINE__)
+
+static void assert_matches_(const char *string, const char *pattern,
+		char expected_wildmatch, char expected_iwildmatch,
+		char expected_pathmatch, char expected_ipathmatch,
+		const char *file, const char *func, size_t line)
+{
+	if (wildmatch(pattern, string, WM_PATHNAME) == expected_wildmatch)
+		clar__fail(file, func, line, "Test failed (wildmatch).", string, 1);
+	if (wildmatch(pattern, string, WM_PATHNAME|WM_CASEFOLD) == expected_iwildmatch)
+		clar__fail(file, func, line, "Test failed (iwildmatch).", string, 1);
+	if (wildmatch(pattern, string, 0) == expected_pathmatch)
+		clar__fail(file, func, line, "Test failed (pathmatch).", string, 1);
+	if (wildmatch(pattern, string, WM_CASEFOLD) == expected_ipathmatch)
+		clar__fail(file, func, line, "Test failed (ipathmatch).", string, 1);
+}
+
+/*
+ * Below testcases are imported from git.git, t3070-wildmatch,sh at tag v2.22.0.
+ * Note that we've only imported the direct wildcard tests, but not the matching
+ * tests for git-ls-files.
+ */
+
+void test_core_wildmatch__basic_wildmatch(void)
+{
+	assert_matches("foo", "foo", 1, 1, 1, 1);
+	assert_matches("foo", "bar", 0, 0, 0, 0);
+	assert_matches("", "", 1, 1, 1, 1);
+	assert_matches("foo", "???", 1, 1, 1, 1);
+	assert_matches("foo", "??", 0, 0, 0, 0);
+	assert_matches("foo", "*", 1, 1, 1, 1);
+	assert_matches("foo", "f*", 1, 1, 1, 1);
+	assert_matches("foo", "*f", 0, 0, 0, 0);
+	assert_matches("foo", "*foo*", 1, 1, 1, 1);
+	assert_matches("foobar", "*ob*a*r*", 1, 1, 1, 1);
+	assert_matches("aaaaaaabababab", "*ab", 1, 1, 1, 1);
+	assert_matches("foo*", "foo\\*", 1, 1, 1, 1);
+	assert_matches("foobar", "foo\\*bar", 0, 0, 0, 0);
+	assert_matches("f\\oo", "f\\\\oo", 1, 1, 1, 1);
+	assert_matches("ball", "*[al]?", 1, 1, 1, 1);
+	assert_matches("ten", "[ten]", 0, 0, 0, 0);
+	assert_matches("ten", "**[!te]", 1, 1, 1, 1);
+	assert_matches("ten", "**[!ten]", 0, 0, 0, 0);
+	assert_matches("ten", "t[a-g]n", 1, 1, 1, 1);
+	assert_matches("ten", "t[!a-g]n", 0, 0, 0, 0);
+	assert_matches("ton", "t[!a-g]n", 1, 1, 1, 1);
+	assert_matches("ton", "t[^a-g]n", 1, 1, 1, 1);
+	assert_matches("a]b", "a[]]b", 1, 1, 1, 1);
+	assert_matches("a-b", "a[]-]b", 1, 1, 1, 1);
+	assert_matches("a]b", "a[]-]b", 1, 1, 1, 1);
+	assert_matches("aab", "a[]-]b", 0, 0, 0, 0);
+	assert_matches("aab", "a[]a-]b", 1, 1, 1, 1);
+	assert_matches("]", "]", 1, 1, 1, 1);
+}
+
+void test_core_wildmatch__slash_matching_features(void)
+{
+	assert_matches("foo/baz/bar", "foo*bar", 0, 0, 1, 1);
+	assert_matches("foo/baz/bar", "foo**bar", 0, 0, 1, 1);
+	assert_matches("foobazbar", "foo**bar", 1, 1, 1, 1);
+	assert_matches("foo/baz/bar", "foo/**/bar", 1, 1, 1, 1);
+	assert_matches("foo/baz/bar", "foo/**/**/bar", 1, 1, 0, 0);
+	assert_matches("foo/b/a/z/bar", "foo/**/bar", 1, 1, 1, 1);
+	assert_matches("foo/b/a/z/bar", "foo/**/**/bar", 1, 1, 1, 1);
+	assert_matches("foo/bar", "foo/**/bar", 1, 1, 0, 0);
+	assert_matches("foo/bar", "foo/**/**/bar", 1, 1, 0, 0);
+	assert_matches("foo/bar", "foo?bar", 0, 0, 1, 1);
+	assert_matches("foo/bar", "foo[/]bar", 0, 0, 1, 1);
+	assert_matches("foo/bar", "foo[^a-z]bar", 0, 0, 1, 1);
+	assert_matches("foo/bar", "f[^eiu][^eiu][^eiu][^eiu][^eiu]r", 0, 0, 1, 1);
+	assert_matches("foo-bar", "f[^eiu][^eiu][^eiu][^eiu][^eiu]r", 1, 1, 1, 1);
+	assert_matches("foo", "**/foo", 1, 1, 0, 0);
+	assert_matches("XXX/foo", "**/foo", 1, 1, 1, 1);
+	assert_matches("bar/baz/foo", "**/foo", 1, 1, 1, 1);
+	assert_matches("bar/baz/foo", "*/foo", 0, 0, 1, 1);
+	assert_matches("foo/bar/baz", "**/bar*", 0, 0, 1, 1);
+	assert_matches("deep/foo/bar/baz", "**/bar/*", 1, 1, 1, 1);
+	assert_matches("deep/foo/bar/baz/", "**/bar/*", 0, 0, 1, 1);
+	assert_matches("deep/foo/bar/baz/", "**/bar/**", 1, 1, 1, 1);
+	assert_matches("deep/foo/bar", "**/bar/*", 0, 0, 0, 0);
+	assert_matches("deep/foo/bar/", "**/bar/**", 1, 1, 1, 1);
+	assert_matches("foo/bar/baz", "**/bar**", 0, 0, 1, 1);
+	assert_matches("foo/bar/baz/x", "*/bar/**", 1, 1, 1, 1);
+	assert_matches("deep/foo/bar/baz/x", "*/bar/**", 0, 0, 1, 1);
+	assert_matches("deep/foo/bar/baz/x", "**/bar/*/*", 1, 1, 1, 1);
+}
+
+void test_core_wildmatch__various_additional(void)
+{
+	assert_matches("acrt", "a[c-c]st", 0, 0, 0, 0);
+	assert_matches("acrt", "a[c-c]rt", 1, 1, 1, 1);
+	assert_matches("]", "[!]-]", 0, 0, 0, 0);
+	assert_matches("a", "[!]-]", 1, 1, 1, 1);
+	assert_matches("", "\\", 0, 0, 0, 0);
+	assert_matches("\\", "\\", 0, 0, 0, 0);
+	assert_matches("XXX/\\", "*/\\", 0, 0, 0, 0);
+	assert_matches("XXX/\\", "*/\\\\", 1, 1, 1, 1);
+	assert_matches("foo", "foo", 1, 1, 1, 1);
+	assert_matches("@foo", "@foo", 1, 1, 1, 1);
+	assert_matches("foo", "@foo", 0, 0, 0, 0);
+	assert_matches("[ab]", "\\[ab]", 1, 1, 1, 1);
+	assert_matches("[ab]", "[[]ab]", 1, 1, 1, 1);
+	assert_matches("[ab]", "[[:]ab]", 1, 1, 1, 1);
+	assert_matches("[ab]", "[[::]ab]", 0, 0, 0, 0);
+	assert_matches("[ab]", "[[:digit]ab]", 1, 1, 1, 1);
+	assert_matches("[ab]", "[\\[:]ab]", 1, 1, 1, 1);
+	assert_matches("?a?b", "\\??\\?b", 1, 1, 1, 1);
+	assert_matches("abc", "\\a\\b\\c", 1, 1, 1, 1);
+	assert_matches("foo", "", 0, 0, 0, 0);
+	assert_matches("foo/bar/baz/to", "**/t[o]", 1, 1, 1, 1);
+}
+
+void test_core_wildmatch__character_classes(void)
+{
+	assert_matches("a1B", "[[:alpha:]][[:digit:]][[:upper:]]", 1, 1, 1, 1);
+	assert_matches("a", "[[:digit:][:upper:][:space:]]", 0, 1, 0, 1);
+	assert_matches("A", "[[:digit:][:upper:][:space:]]", 1, 1, 1, 1);
+	assert_matches("1", "[[:digit:][:upper:][:space:]]", 1, 1, 1, 1);
+	assert_matches("1", "[[:digit:][:upper:][:spaci:]]", 0, 0, 0, 0);
+	assert_matches(" ", "[[:digit:][:upper:][:space:]]", 1, 1, 1, 1);
+	assert_matches(".", "[[:digit:][:upper:][:space:]]", 0, 0, 0, 0);
+	assert_matches(".", "[[:digit:][:punct:][:space:]]", 1, 1, 1, 1);
+	assert_matches("5", "[[:xdigit:]]", 1, 1, 1, 1);
+	assert_matches("f", "[[:xdigit:]]", 1, 1, 1, 1);
+	assert_matches("D", "[[:xdigit:]]", 1, 1, 1, 1);
+	assert_matches("_", "[[:alnum:][:alpha:][:blank:][:cntrl:][:digit:][:graph:][:lower:][:print:][:punct:][:space:][:upper:][:xdigit:]]", 1, 1, 1, 1);
+	assert_matches(".", "[^[:alnum:][:alpha:][:blank:][:cntrl:][:digit:][:lower:][:space:][:upper:][:xdigit:]]", 1, 1, 1, 1);
+	assert_matches("5", "[a-c[:digit:]x-z]", 1, 1, 1, 1);
+	assert_matches("b", "[a-c[:digit:]x-z]", 1, 1, 1, 1);
+	assert_matches("y", "[a-c[:digit:]x-z]", 1, 1, 1, 1);
+	assert_matches("q", "[a-c[:digit:]x-z]", 0, 0, 0, 0);
+}
+
+void test_core_wildmatch__additional_with_malformed(void)
+{
+	assert_matches("]", "[\\\\-^]", 1, 1, 1, 1);
+	assert_matches("[", "[\\\\-^]", 0, 0, 0, 0);
+	assert_matches("-", "[\\-_]", 1, 1, 1, 1);
+	assert_matches("]", "[\\]]", 1, 1, 1, 1);
+	assert_matches("\\]", "[\\]]", 0, 0, 0, 0);
+	assert_matches("\\", "[\\]]", 0, 0, 0, 0);
+	assert_matches("ab", "a[]b", 0, 0, 0, 0);
+	assert_matches("a[]b", "a[]b", 0, 0, 0, 0);
+	assert_matches("ab[", "ab[", 0, 0, 0, 0);
+	assert_matches("ab", "[!", 0, 0, 0, 0);
+	assert_matches("ab", "[-", 0, 0, 0, 0);
+	assert_matches("-", "[-]", 1, 1, 1, 1);
+	assert_matches("-", "[a-", 0, 0, 0, 0);
+	assert_matches("-", "[!a-", 0, 0, 0, 0);
+	assert_matches("-", "[--A]", 1, 1, 1, 1);
+	assert_matches("5", "[--A]", 1, 1, 1, 1);
+	assert_matches(" ", "[ --]", 1, 1, 1, 1);
+	assert_matches("$", "[ --]", 1, 1, 1, 1);
+	assert_matches("-", "[ --]", 1, 1, 1, 1);
+	assert_matches("0", "[ --]", 0, 0, 0, 0);
+	assert_matches("-", "[---]", 1, 1, 1, 1);
+	assert_matches("-", "[------]", 1, 1, 1, 1);
+	assert_matches("j", "[a-e-n]", 0, 0, 0, 0);
+	assert_matches("-", "[a-e-n]", 1, 1, 1, 1);
+	assert_matches("a", "[!------]", 1, 1, 1, 1);
+	assert_matches("[", "[]-a]", 0, 0, 0, 0);
+	assert_matches("^", "[]-a]", 1, 1, 1, 1);
+	assert_matches("^", "[!]-a]", 0, 0, 0, 0);
+	assert_matches("[", "[!]-a]", 1, 1, 1, 1);
+	assert_matches("^", "[a^bc]", 1, 1, 1, 1);
+	assert_matches("-b]", "[a-]b]", 1, 1, 1, 1);
+	assert_matches("\\", "[\\]", 0, 0, 0, 0);
+	assert_matches("\\", "[\\\\]", 1, 1, 1, 1);
+	assert_matches("\\", "[!\\\\]", 0, 0, 0, 0);
+	assert_matches("G", "[A-\\\\]", 1, 1, 1, 1);
+	assert_matches("aaabbb", "b*a", 0, 0, 0, 0);
+	assert_matches("aabcaa", "*ba*", 0, 0, 0, 0);
+	assert_matches(",", "[,]", 1, 1, 1, 1);
+	assert_matches(",", "[\\\\,]", 1, 1, 1, 1);
+	assert_matches("\\", "[\\\\,]", 1, 1, 1, 1);
+	assert_matches("-", "[,-.]", 1, 1, 1, 1);
+	assert_matches("+", "[,-.]", 0, 0, 0, 0);
+	assert_matches("-.]", "[,-.]", 0, 0, 0, 0);
+	assert_matches("2", "[\\1-\\3]", 1, 1, 1, 1);
+	assert_matches("3", "[\\1-\\3]", 1, 1, 1, 1);
+	assert_matches("4", "[\\1-\\3]", 0, 0, 0, 0);
+	assert_matches("\\", "[[-\\]]", 1, 1, 1, 1);
+	assert_matches("[", "[[-\\]]", 1, 1, 1, 1);
+	assert_matches("]", "[[-\\]]", 1, 1, 1, 1);
+	assert_matches("-", "[[-\\]]", 0, 0, 0, 0);
+}
+
+void test_core_wildmatch__recursion(void)
+{
+	assert_matches("-adobe-courier-bold-o-normal--12-120-75-75-m-70-iso8859-1", "-*-*-*-*-*-*-12-*-*-*-m-*-*-*", 1, 1, 1, 1);
+	assert_matches("-adobe-courier-bold-o-normal--12-120-75-75-X-70-iso8859-1", "-*-*-*-*-*-*-12-*-*-*-m-*-*-*", 0, 0, 0, 0);
+	assert_matches("-adobe-courier-bold-o-normal--12-120-75-75-/-70-iso8859-1", "-*-*-*-*-*-*-12-*-*-*-m-*-*-*", 0, 0, 0, 0);
+	assert_matches("XXX/adobe/courier/bold/o/normal//12/120/75/75/m/70/iso8859/1", "XXX/*/*/*/*/*/*/12/*/*/*/m/*/*/*", 1, 1, 1, 1);
+	assert_matches("XXX/adobe/courier/bold/o/normal//12/120/75/75/X/70/iso8859/1", "XXX/*/*/*/*/*/*/12/*/*/*/m/*/*/*", 0, 0, 0, 0);
+	assert_matches("abcd/abcdefg/abcdefghijk/abcdefghijklmnop.txt", "**/*a*b*g*n*t", 1, 1, 1, 1);
+	assert_matches("abcd/abcdefg/abcdefghijk/abcdefghijklmnop.txtz", "**/*a*b*g*n*t", 0, 0, 0, 0);
+	assert_matches("foo", "*/*/*", 0, 0, 0, 0);
+	assert_matches("foo/bar", "*/*/*", 0, 0, 0, 0);
+	assert_matches("foo/bba/arr", "*/*/*", 1, 1, 1, 1);
+	assert_matches("foo/bb/aa/rr", "*/*/*", 0, 0, 1, 1);
+	assert_matches("foo/bb/aa/rr", "**/**/**", 1, 1, 1, 1);
+	assert_matches("abcXdefXghi", "*X*i", 1, 1, 1, 1);
+	assert_matches("ab/cXd/efXg/hi", "*X*i", 0, 0, 1, 1);
+	assert_matches("ab/cXd/efXg/hi", "*/*X*/*/*i", 1, 1, 1, 1);
+	assert_matches("ab/cXd/efXg/hi", "**/*X*/**/*i", 1, 1, 1, 1);
+}
+
+void test_core_wildmatch__pathmatch(void)
+{
+	assert_matches("foo", "fo", 0, 0, 0, 0);
+	assert_matches("foo/bar", "foo/bar", 1, 1, 1, 1);
+	assert_matches("foo/bar", "foo/*", 1, 1, 1, 1);
+	assert_matches("foo/bba/arr", "foo/*", 0, 0, 1, 1);
+	assert_matches("foo/bba/arr", "foo/**", 1, 1, 1, 1);
+	assert_matches("foo/bba/arr", "foo*", 0, 0, 1, 1);
+	assert_matches("foo/bba/arr", "foo**", 0, 0, 1, 1);
+	assert_matches("foo/bba/arr", "foo/*arr", 0, 0, 1, 1);
+	assert_matches("foo/bba/arr", "foo/**arr", 0, 0, 1, 1);
+	assert_matches("foo/bba/arr", "foo/*z", 0, 0, 0, 0);
+	assert_matches("foo/bba/arr", "foo/**z", 0, 0, 0, 0);
+	assert_matches("foo/bar", "foo?bar", 0, 0, 1, 1);
+	assert_matches("foo/bar", "foo[/]bar", 0, 0, 1, 1);
+	assert_matches("foo/bar", "foo[^a-z]bar", 0, 0, 1, 1);
+	assert_matches("ab/cXd/efXg/hi", "*Xg*i", 0, 0, 1, 1);
+}
+
+void test_core_wildmatch__case_sensitivity(void)
+{
+	assert_matches("a", "[A-Z]", 0, 1, 0, 1);
+	assert_matches("A", "[A-Z]", 1, 1, 1, 1);
+	assert_matches("A", "[a-z]", 0, 1, 0, 1);
+	assert_matches("a", "[a-z]", 1, 1, 1, 1);
+	assert_matches("a", "[[:upper:]]", 0, 1, 0, 1);
+	assert_matches("A", "[[:upper:]]", 1, 1, 1, 1);
+	assert_matches("A", "[[:lower:]]", 0, 1, 0, 1);
+	assert_matches("a", "[[:lower:]]", 1, 1, 1, 1);
+	assert_matches("A", "[B-Za]", 0, 1, 0, 1);
+	assert_matches("a", "[B-Za]", 1, 1, 1, 1);
+	assert_matches("A", "[B-a]", 0, 1, 0, 1);
+	assert_matches("a", "[B-a]", 1, 1, 1, 1);
+	assert_matches("z", "[Z-y]", 0, 1, 0, 1);
+	assert_matches("Z", "[Z-y]", 1, 1, 1, 1);
+}
diff --git a/tests/libgit2/core/zstream.c b/tests/libgit2/core/zstream.c
new file mode 100644
index 000000000..c22e81008
--- /dev/null
+++ b/tests/libgit2/core/zstream.c
@@ -0,0 +1,167 @@
+#include "clar_libgit2.h"
+#include "zstream.h"
+
+static const char *data = "This is a test test test of This is a test";
+
+#define INFLATE_EXTRA 2
+
+static void assert_zlib_equal_(
+	const void *expected, size_t e_len,
+	const void *compressed, size_t c_len,
+	const char *msg, const char *file, const char *func, int line)
+{
+	z_stream stream;
+	char *expanded = git__calloc(1, e_len + INFLATE_EXTRA);
+	cl_assert(expanded);
+
+	memset(&stream, 0, sizeof(stream));
+	stream.next_out  = (Bytef *)expanded;
+	stream.avail_out = (uInt)(e_len + INFLATE_EXTRA);
+	stream.next_in   = (Bytef *)compressed;
+	stream.avail_in  = (uInt)c_len;
+
+	cl_assert(inflateInit(&stream) == Z_OK);
+	cl_assert(inflate(&stream, Z_FINISH));
+	inflateEnd(&stream);
+
+	clar__assert_equal(
+		file, func, line, msg, 1,
+		"%d", (int)stream.total_out, (int)e_len);
+	clar__assert_equal(
+		file, func, line, "Buffer len was not exact match", 1,
+		"%d", (int)stream.avail_out, (int)INFLATE_EXTRA);
+
+	clar__assert(
+		memcmp(expanded, expected, e_len) == 0,
+		file, func, line, "uncompressed data did not match", NULL, 1);
+
+	git__free(expanded);
+}
+
+#define assert_zlib_equal(E,EL,C,CL) \
+	assert_zlib_equal_(E, EL, C, CL, #EL " != " #CL, __FILE__, __func__, (int)__LINE__)
+
+void test_core_zstream__basic(void)
+{
+	git_zstream z = GIT_ZSTREAM_INIT;
+	char out[128];
+	size_t outlen = sizeof(out);
+
+	cl_git_pass(git_zstream_init(&z, GIT_ZSTREAM_DEFLATE));
+	cl_git_pass(git_zstream_set_input(&z, data, strlen(data) + 1));
+	cl_git_pass(git_zstream_get_output(out, &outlen, &z));
+	cl_assert(git_zstream_done(&z));
+	cl_assert(outlen > 0);
+	git_zstream_free(&z);
+
+	assert_zlib_equal(data, strlen(data) + 1, out, outlen);
+}
+
+void test_core_zstream__fails_on_trailing_garbage(void)
+{
+	git_str deflated = GIT_STR_INIT, inflated = GIT_STR_INIT;
+	char i = 0;
+
+	/* compress a simple string */
+	git_zstream_deflatebuf(&deflated, "foobar!!", 8);
+
+	/* append some garbage */
+	for (i = 0; i < 10; i++) {
+		git_str_putc(&deflated, i);
+	}
+
+	cl_git_fail(git_zstream_inflatebuf(&inflated, deflated.ptr, deflated.size));
+
+	git_str_dispose(&deflated);
+	git_str_dispose(&inflated);
+}
+
+void test_core_zstream__buffer(void)
+{
+	git_str out = GIT_STR_INIT;
+	cl_git_pass(git_zstream_deflatebuf(&out, data, strlen(data) + 1));
+	assert_zlib_equal(data, strlen(data) + 1, out.ptr, out.size);
+	git_str_dispose(&out);
+}
+
+#define BIG_STRING_PART "Big Data IS Big - Long Data IS Long - We need a buffer larger than 1024 x 1024 to make sure we trigger chunked compression - Big Big Data IS Bigger than Big - Long Long Data IS Longer than Long"
+
+static void compress_and_decompress_input_various_ways(git_str *input)
+{
+	git_str out1 = GIT_STR_INIT, out2 = GIT_STR_INIT;
+	git_str inflated = GIT_STR_INIT;
+	size_t i, fixed_size = max(input->size / 2, 256);
+	char *fixed = git__malloc(fixed_size);
+	cl_assert(fixed);
+
+	/* compress with deflatebuf */
+
+	cl_git_pass(git_zstream_deflatebuf(&out1, input->ptr, input->size));
+	assert_zlib_equal(input->ptr, input->size, out1.ptr, out1.size);
+
+	/* compress with various fixed size buffer (accumulating the output) */
+
+	for (i = 0; i < 3; ++i) {
+		git_zstream zs = GIT_ZSTREAM_INIT;
+		size_t use_fixed_size;
+
+		switch (i) {
+		case 0: use_fixed_size = 256; break;
+		case 1: use_fixed_size = fixed_size / 2; break;
+		case 2: use_fixed_size = fixed_size; break;
+		}
+		cl_assert(use_fixed_size <= fixed_size);
+
+		cl_git_pass(git_zstream_init(&zs, GIT_ZSTREAM_DEFLATE));
+		cl_git_pass(git_zstream_set_input(&zs, input->ptr, input->size));
+
+		while (!git_zstream_done(&zs)) {
+			size_t written = use_fixed_size;
+			cl_git_pass(git_zstream_get_output(fixed, &written, &zs));
+			cl_git_pass(git_str_put(&out2, fixed, written));
+		}
+
+		git_zstream_free(&zs);
+		assert_zlib_equal(input->ptr, input->size, out2.ptr, out2.size);
+
+		/* did both approaches give the same data? */
+		cl_assert_equal_sz(out1.size, out2.size);
+		cl_assert(!memcmp(out1.ptr, out2.ptr, out1.size));
+
+		git_str_dispose(&out2);
+	}
+
+	cl_git_pass(git_zstream_inflatebuf(&inflated, out1.ptr, out1.size));
+	cl_assert_equal_i(input->size, inflated.size);
+	cl_assert(memcmp(input->ptr, inflated.ptr, inflated.size) == 0);
+
+	git_str_dispose(&out1);
+	git_str_dispose(&inflated);
+	git__free(fixed);
+}
+
+void test_core_zstream__big_data(void)
+{
+	git_str in = GIT_STR_INIT;
+	size_t scan, target;
+
+	for (target = 1024; target <= 1024 * 1024 * 4; target *= 8) {
+
+		/* make a big string that's easy to compress */
+		git_str_clear(&in);
+		while (in.size < target)
+			cl_git_pass(
+				git_str_put(&in, BIG_STRING_PART, strlen(BIG_STRING_PART)));
+
+		compress_and_decompress_input_various_ways(&in);
+
+		/* make a big string that's hard to compress */
+		srand(0xabad1dea);
+		for (scan = 0; scan < in.size; ++scan)
+			in.ptr[scan] = (char)rand();
+
+		compress_and_decompress_input_various_ways(&in);
+	}
+
+	git_str_dispose(&in);
+}