Sort list of files that are missing OWNERS LGTM in presubmit check.

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 2401 matching lines @@
                                            'other than john@example.com\n')
     self.AssertOwnersWorks(approvers=set(['john@example.com']),
                            is_committing=False,
                            expected_output='')
 
   def testCannedCheckOwners_AuthorCountsAsOwner(self):
     self.AssertOwnersWorks(approvers=set(['john@example.com',
                                           'brett@example.com']),
                            reviewers=set(['john@example.com',
                                           'ben@example.com']),
-                           uncovered_files=set(['foo/xyz.cc']),
+                           uncovered_files=set(['foo/xyz.cc', 'foo/bar.cc']),
                            expected_output='Missing LGTM from an OWNER '
-                                           'for these files:\n    foo/xyz.cc\n',
+                                           'for these files:\n'
+                                           '    foo/bar.cc\n'
+                                           '    foo/xyz.cc\n',
                            author_counts_as_owner=False)
 
   def testCannedCheckOwners_TBR(self):
     self.AssertOwnersWorks(tbr=True,
         expected_output='--tbr was specified, skipping OWNERS check\n')
     self.AssertOwnersWorks(tbr=True, is_committing=False, expected_output='')
 
   def testCannedCheckOwners_WithoutOwnerLGTM(self):
     self.AssertOwnersWorks(uncovered_files=set(['foo']),
         expected_output='Missing LGTM from an OWNER for these files:\n'
@@ skipping 100 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()