Fix Gerrit git cl land and add test.

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 1876 matching lines @@
     self.calls += [
         ((['exists', '/abs/git_repo_root/.git/hooks/commit-msg'],), True),
         ((['FileRead', '/abs/git_repo_root/.git/hooks/commit-msg'],),
          '...\n# From Gerrit Code Review\n...\nadd_ChangeId()\n'),
         (('Do you want to remove it now? [Yes/No]',), 'Yes'),
         ((['rm_file_or_tree', '/abs/git_repo_root/.git/hooks/commit-msg'],),
          ''),
     ]
     cl._codereview_impl._GerritCommitMsgHookCheck(offer_removal=True)
 
+  def test_GerritCmdLand(self):
+    self.calls += [
+      ((['git', 'symbolic-ref', 'HEAD'],), 'feature'),
+      ((['git', 'config', 'branch.feature.gerritsquashhash'],),
+       'deadbeaf'),
+      ((['git', 'diff', 'deadbeaf'],), ''),  # No diff.
+      ((['git', 'config', 'branch.feature.gerritserver'],),
+       'chromium-review.googlesource.com'),
+    ]
+    cl = git_cl.Changelist(issue=123, codereview='gerrit')
+    cl._codereview_impl._GetChangeDetail = lambda _: {
+      'labels': {},
+      'current_revision': 'deadbeaf',
+    }
+    cl._codereview_impl.SubmitIssue = lambda wait_for_merge: None
+    self.assertEqual(0, cl.CMDLand(force=True, bypass_hooks=True, verbose=True))
+
 
 if __name__ == '__main__':
   git_cl.logging.basicConfig(
       level=git_cl.logging.DEBUG if '-v' in sys.argv else git_cl.logging.ERROR)
   unittest.main()