Move all revision parsing code to _EnforceRevisions.

tests/fake_repos.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 """Generate fake repositories for testing."""
 
 import atexit
 import logging
 import os
+import pprint
 import re
 import shutil
 import subprocess
 import sys
 import unittest
 
 
 ## Utility functions
 
 
@@ skipping 472 matching lines @@
   def assertTree(self, tree, tree_root=None):
     """Diff the checkout tree with a dict."""
     if not tree_root:
       tree_root = self.root_dir
     actual = read_tree(tree_root)
     diff = dict_diff(tree, actual)
     if diff:
       logging.debug('Actual %s\n%s' % (tree_root, pprint.pformat(actual)))
       logging.debug('Expected\n%s' % pprint.pformat(tree))
       logging.debug('Diff\n%s' % pprint.pformat(diff))
+      self.assertEquals(diff, [])
 
 
 def main(argv):
   fake = FakeRepos()
   print 'Using %s' % fake.trial_dir()
   try:
     fake.setUp()
     print('Fake setup, press enter to quit or Ctrl-C to keep the checkouts.')
     sys.stdin.readline()
   except KeyboardInterrupt:
     fake.SHOULD_LEAK = True
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))