diff --git a/flake8/tests/test_hooks.py b/flake8/tests/test_hooks.py
index db868bd..ba46794 100644
--- a/flake8/tests/test_hooks.py
+++ b/flake8/tests/test_hooks.py
@@ -17,21 +17,18 @@ def excluded(filename):
 
 class TestGitHook(unittest.TestCase):
     if is_windows:
+        # On Windows, absolute paths start with a drive letter, for example C:
+        # Here we build a fake absolute path starting with the current drive
+        # letter, for example C:\fake\temp
         current_drive, ignore_tail = os.path.splitdrive(os.getcwd())
-        fake_path_at_root_of_filesystem = os.path.join(current_drive,
-                                                       os.path.sep,
-                                                       'fake',
-                                                       'tmp')
+        fake_abs_path = os.path.join(current_drive, os.path.sep, 'fake', 'tmp')
     else:
-        fake_path_at_root_of_filesystem = os.path.join(os.path.sep,
-                                                       'fake',
-                                                       'tmp')
+        fake_abs_path = os.path.join(os.path.sep, 'fake', 'tmp')
 
     @mock.patch('os.makedirs')
     @mock.patch('flake8.hooks.open', create=True)
     @mock.patch('shutil.rmtree')
-    @mock.patch('tempfile.mkdtemp',
-                return_value=fake_path_at_root_of_filesystem)
+    @mock.patch('tempfile.mkdtemp', return_value=fake_abs_path)
     @mock.patch('flake8.hooks.run',
                 return_value=(None,
                               [os.path.join('foo', 'afile.py'),
@@ -50,9 +47,10 @@ class TestGitHook(unittest.TestCase):
         dirname, filename = os.path.split(
             os.path.abspath(os.path.join('foo', 'bfile.py')))
         if is_windows:
+            # In Windows, the absolute path in dirname will start with a drive
+            # letter. Here, we discad the drive letter.
             ignore_drive, dirname = os.path.splitdrive(dirname)
-        tmpdir = os.path.join(self.fake_path_at_root_of_filesystem,
-                              dirname[1:])
+        tmpdir = os.path.join(self.fake_abs_path, dirname[1:])
         tmpfile = os.path.join(tmpdir, 'bfile.py')
         style_guide.check_files.assert_called_once_with([tmpfile])