git_test_utils: Automatic commit dates are now in UTC.

tests/git_common_test.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 """Unit tests for git_common.py"""
 
 import binascii
 import collections
 import os
@@ skipping 754 matching lines @@
     EXPECTED_LINKS = [
         'config', 'info', 'hooks', 'logs/refs', 'objects', 'refs',
     ]
     for path in EXPECTED_LINKS:
       self.assertTrue(os.path.islink(os.path.join(workdir, '.git', path)))
       self.assertEqual(os.path.realpath(os.path.join(workdir, '.git', path)),
                        os.path.join(self.repo.repo_path, '.git', path))
     self.assertFalse(os.path.islink(os.path.join(workdir, '.git', 'HEAD')))
 
 
+class GitTestUtilsTest(git_test_utils.GitRepoReadOnlyTestBase):
+  REPO_SCHEMA = """
+  A B
+  """
+
+  COMMIT_A = {
+    'file1': {'data': 'file1'},
+  }
+
+  COMMIT_B = {
+    'file1': {'data': 'file1 changed'},
+  }
+
+  def testAutomaticCommitDates(self):
+    # The dates should start from 1970-01-01 and automatically increment. They
+    # must be in UTC (otherwise the tests are system-dependent, and if your
+    # local timezone is positive, timestamps will be <0 which causes bizarre
+    # behaviour in Git; http://crbug.com/581895).
+    self.assertEquals('Author McAuthorly 1970-01-01 00:00:00 +0000',
+                      self.repo.show_commit('A', format_string='%an %ai'))
+    self.assertEquals('Charles Committish 1970-01-02 00:00:00 +0000',
+                      self.repo.show_commit('A', format_string='%cn %ci'))
+    self.assertEquals('Author McAuthorly 1970-01-03 00:00:00 +0000',
+                      self.repo.show_commit('B', format_string='%an %ai'))
+    self.assertEquals('Charles Committish 1970-01-04 00:00:00 +0000',
+                      self.repo.show_commit('B', format_string='%cn %ci'))
+
 
 if __name__ == '__main__':
   sys.exit(coverage_utils.covered_main(
     os.path.join(DEPOT_TOOLS_ROOT, 'git_common.py')))