diff::parse tests: test parsing a diff

Test that we can create a diff file, then parse the results and
that the two are identical in-memory.

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/diff/diff_helpers.c b/tests/diff/diff_helpers.c
index c6cdf803f..8fa8e3eb5 100644
--- a/tests/diff/diff_helpers.c
+++ b/tests/diff/diff_helpers.c
@@ -241,3 +241,39 @@ void diff_print_raw(FILE *fp, git_diff *diff)
 		git_diff_print(diff, GIT_DIFF_FORMAT_RAW,
 			git_diff_print_callback__to_file_handle, fp ? fp : stderr));
 }
+
+void diff_assert_equal(git_diff *a, git_diff *b)
+{
+	const git_diff_delta *ad, *bd;
+	size_t i;
+
+	assert(a && b);
+
+	cl_assert_equal_i(git_diff_num_deltas(a), git_diff_num_deltas(b));
+
+	for (i = 0; i < git_diff_num_deltas(a); i++) {
+		ad = git_diff_get_delta(a, i);
+		bd = git_diff_get_delta(b, i);
+
+		cl_assert_equal_i(ad->status, bd->status);
+		cl_assert_equal_i(ad->flags, bd->flags);
+		cl_assert_equal_i(ad->similarity, bd->similarity);
+		cl_assert_equal_i(ad->nfiles, bd->nfiles);
+
+		/* Don't examine the size or the flags of the deltas;
+		 * computed deltas have sizes (parsed deltas do not) and
+		 * computed deltas will have flags of `VALID_ID` and
+		 * `EXISTS` (parsed deltas will not query the ODB.)
+		 */
+		cl_assert_equal_oid(&ad->old_file.id, &bd->old_file.id);
+		cl_assert_equal_i(ad->old_file.id_abbrev, bd->old_file.id_abbrev);
+		cl_assert_equal_s(ad->old_file.path, bd->old_file.path);
+		cl_assert_equal_i(ad->old_file.mode, bd->old_file.mode);
+
+		cl_assert_equal_oid(&ad->new_file.id, &bd->new_file.id);
+		cl_assert_equal_i(ad->new_file.id_abbrev, bd->new_file.id_abbrev);
+		cl_assert_equal_s(ad->new_file.path, bd->new_file.path);
+		cl_assert_equal_i(ad->new_file.mode, bd->new_file.mode);
+	}
+}
+