Add test for git-svn with submodule/merge layout.

tests/git_cl_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.
 
 """Unit tests for git_cl.py."""
 
 import os
 import StringIO
 import stat
@@ skipping 130 matching lines @@
       ((['git', 'config', '--get-regexp', '^svn-remote\\.'],),
        ((('svn-remote.svn.url svn://svn.chromium.org/chrome\n'
           'svn-remote.svn.fetch trunk/src:refs/remotes/origin/master'),
          None),
         0)),
       ((['git', 'config', 'rietveld.server'],), 'codereview.example.com'),
       ((['git', 'symbolic-ref', 'HEAD'],), 'refs/heads/working'),
       ((['git', 'config', 'branch.working.merge'],), 'refs/heads/master'),
       ((['git', 'config', 'branch.working.remote'],), 'origin'),
       ((['git', 'rev-list', '--merges',
-         '--grep="^SVN changes up to revision [0-9]*$"',
+         '--grep=^SVN changes up to revision [0-9]*$',
          'refs/remotes/origin/master^!'],), ''),
       ((['git', 'update-index', '--refresh', '-q'],), ''),
       ((['git', 'diff-index', 'HEAD'],), ''),
       ((['git', 'rev-list', '^refs/heads/working',
          'refs/remotes/origin/master'],),
          ''),
       ((['git', 'log', '--grep=^git-svn-id:', '-1', '--pretty=format:%H'],),
          '3fc18b62c4966193eb435baabe2d18a3810ec82e'),
       ((['git', 'rev-list', '^3fc18b62c4966193eb435baabe2d18a3810ec82e',
          'refs/remotes/origin/master'],), ''),
@@ skipping 296 matching lines @@
         ((['git', 'config', 'rietveld.viewvc-url'],), ''),
         (('ViewVC URL:',), ''),
         # DownloadHooks(True)
         ((commit_msg_path, os.X_OK,), True),
         ]
     git_cl.main(['config'])
 
 
 if __name__ == '__main__':
   unittest.main()