Fix errors in async_push.py and test code.

tests/project_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Integration tests for project.py."""
 
 import logging
 import os
 import random
@@ skipping 32 matching lines @@
   @staticmethod
   def get(user):
     return '1%s1' % user
 
 
 class TestCase(mocks.TestCase):
   def setUp(self):
     super(TestCase, self).setUp()
     self.mock(projects.creds, 'Credentials', CredentialsMock)
     self.mock(projects, '_read_lines', self._read_lines)
+    self.mock(
+        projects.async_push,
+        'AsyncPush', lambda _1, _2: mocks.AsyncPushMock(self))
     class Dummy(object):
       @staticmethod
       def get_list():
         return []
     if not projects.chromium_committers:
       projects.chromium_committers = Dummy()
     self.mock(
         projects.chromium_committers, 'get_list', self._get_committers_list)
     if not projects.nacl_committers:
       projects.nacl_committers = Dummy()
@@ skipping 430 matching lines @@
     ]
     self._verify_final_state(pending_manager.queue.get(issue).verifications,
                              why_not, rietveld_calls)
 
 
 if __name__ == '__main__':
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.WARNING,
       format='%(levelname)5s %(module)15s(%(lineno)3d): %(message)s')
   unittest.main()