Fix assert statement in Git.unstaged_changes.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git_unittest.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import unittest
 
 from webkitpy.common.system.executive import Executive, ScriptError
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.common.system.filesystem import FileSystem
 from webkitpy.common.system.filesystem_mock import MockFileSystem
@@ skipping 213 matching lines @@
 
     def test_timestamp_of_revision_pacific_timezone(self):
         self._assert_timestamp_of_revision('Date: 2013-02-08 01:55:21 -0800', '2013-02-08T09:55:21Z')
 
     def test_unstaged_files(self):
         git = self.make_git()
         status_lines = [
             ' M d/modified.txt',
             ' D d/deleted.txt',
             '?? d/untracked.txt',
+            '?? a',
             'D  d/deleted.txt',
             'M  d/modified-staged.txt',
             'A  d/added-staged.txt',
         ]
         # pylint: disable=protected-access
         git._run_git = lambda args: '\x00'.join(status_lines) + '\x00'
         self.assertEqual(
             git.unstaged_changes(),
             {
                 'd/modified.txt': 'M',
                 'd/deleted.txt': 'D',
                 'd/untracked.txt': '?',
+                'a': '?',
             })