3 files changed, 57 insertions, 12 deletions
diff --git a/git/test/test_docs.py b/git/test/test_docs.py
index 586f0ce4..965d10fb 100644
--- a/git/test/test_docs.py
+++ b/git/test/test_docs.py
@@ -437,6 +437,15 @@ class Tutorials(TestBase):
         git.for_each_ref()                              # '-' becomes '_' when calling it
         # ![31-test_references_and_objects]
 
+        # [32-test_references_and_objects]
+        private_key_file = os.path.join(rw_dir, 'id_rsa_deployment_key')
+        with repo.git.sshkey(private_key_file):
+            # Note that we don't actually make the call here, as our test-setup doesn't permit it to 
+            # succeed.
+            # It will in your case :)
+            repo.remotes.origin.fetch
+        # ![32-test_references_and_objects]
+
     def test_submodules(self):
         # [1-test_submodules]
         repo = self.rorepo
diff --git a/git/test/test_git.py b/git/test/test_git.py
index f25fa21a..990f4cd0 100644
--- a/git/test/test_git.py
+++ b/git/test/test_git.py
@@ -4,18 +4,24 @@
 #
 # This module is part of GitPython and is released under
 # the BSD License: http://www.opensource.org/licenses/bsd-license.php
-
 import os
 import mock
-from git.test.lib import (TestBase,
-                          patch,
-                          raises,
-                          assert_equal,
-                          assert_true,
-                          assert_match,
-                          fixture_path)
-from git import (Git,
-                 GitCommandError)
+
+from git.test.lib import (
+    TestBase,
+    patch,
+    raises,
+    assert_equal,
+    assert_true,
+    assert_match,
+    fixture_path
+)
+from git import (
+    Git,
+    GitCommandError,
+    Repo
+)
+from gitdb.test.lib import with_rw_directory
 
 from git.compat import PY3
 
@@ -153,3 +159,33 @@ class TestGit(TestBase):
         editor = 'non_existant_editor'
         with mock.patch.dict('os.environ', {'GIT_EDITOR': editor}):
             assert self.git.var("GIT_EDITOR") == editor
+
+    @with_rw_directory
+    def test_environment(self, rw_dir):
+        # sanity check
+        assert self.git.environment() == {}
+
+        # make sure the context manager works and cleans up after itself
+        with self.git.custom_environment(PWD='/tmp'):
+            assert self.git.environment() == {'PWD': '/tmp'}
+
+        assert self.git.environment() == {}
+
+        old_env = self.git.update_environment(VARKEY='VARVALUE')
+        # The returned dict can be used to revert the change, hence why it has
+        # an entry with value 'None'.
+        assert old_env == {'VARKEY': None}
+        assert self.git.environment() == {'VARKEY': 'VARVALUE'}
+
+        new_env = self.git.update_environment(**old_env)
+        assert new_env == {'VARKEY': 'VARVALUE'}
+        assert self.git.environment() == {}
+
+        rw_repo = Repo.init(os.path.join(rw_dir, 'repo'))
+        remote = rw_repo.create_remote('ssh-origin', "ssh://git@server/foo")
+
+        with rw_repo.git.sshkey('doesntexist.key'):
+            remote.fetch()
+        # end
+
+
diff --git a/git/test/test_remote.py b/git/test/test_remote.py
index 4fd78230..98d74d8b 100644
--- a/git/test/test_remote.py
+++ b/git/test/test_remote.py
@@ -164,11 +164,11 @@ class TestRemote(TestBase):
         def get_info(res, remote, name):
             return res["%s/%s" % (remote, name)]
 
-        # put remote head to master as it is garantueed to exist
+        # put remote head to master as it is guaranteed to exist
         remote_repo.head.reference = remote_repo.heads.master
 
         res = fetch_and_test(remote)
-        # all uptodate
+        # all up to date
         for info in res:
             assert info.flags & info.HEAD_UPTODATE