Fix RunPylint affected files regex issue

tests/presubmit_unittest.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 presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint: disable=E1101,E1103
 
 import logging
@@ skipping 2159 matching lines @@
     child.communicate()
     child.returncode = 0
 
     input_api.subprocess.Popen(['pyyyyython', pylint, '--args-on-stdin'],
         env=mox.IgnoreArg(), stdin=subprocess.PIPE).AndReturn(child)
     self.mox.ReplayAll()
 
     results = presubmit_canned_checks.RunPylint(
         input_api, presubmit.OutputApi)
     self.assertEquals([], results)
+    self.checkstdout('Running pylint on 1 files.\n')
 
   def testCheckBuildbotPendingBuildsBad(self):
     input_api = self.MockInputApi(None, True)
     connection = self.mox.CreateMockAnything()
     input_api.urllib2.urlopen('uurl').AndReturn(connection)
     connection.read().AndReturn('foo')
     connection.close()
     self.mox.ReplayAll()
 
     results = presubmit_canned_checks.CheckBuildbotPendingBuilds(
@@ skipping 295 matching lines @@
         owners_check=False)
     self.assertEqual(1, len(results))
     self.assertEqual(
         'Found line ending with white spaces in:', results[0]._message)
     self.checkstdout('')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()