Remove redundant output in git_cl.py tests.

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 1939 matching lines @@
       ((['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
+    out = StringIO.StringIO()
+    self.mock(sys, 'stdout', out)
     self.assertEqual(0, cl.CMDLand(force=True, bypass_hooks=True, verbose=True))
+    self.assertRegexpMatches(out.getvalue(), 'Issue.*123 has been submitted')
 
 
 if __name__ == '__main__':
   git_cl.logging.basicConfig(
       level=git_cl.logging.DEBUG if '-v' in sys.argv else git_cl.logging.ERROR)
   unittest.main()