Extract authentication options handling into a separate function.

tests/gcl_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 gcl.py."""
 
 # pylint: disable=E1103,E1101,E1120
 
 import os
@@ skipping 86 matching lines @@
         'DEFAULT_LINT_REGEX', 'CheckHomeForFile', 'DoPresubmitChecks',
         'ErrorExit', 'FILES_CACHE', 'FilterFlag', 'GenUsage',
         'GenerateChangeName', 'GenerateDiff', 'GetCLs', 'GetCacheDir',
         'GetCachedFile', 'GetChangelistInfoFile', 'GetChangesDir',
         'GetCodeReviewSetting', 'GetFilesNotInCL', 'GetInfoDir',
         'GetModifiedFiles', 'GetRepositoryRoot', 'GetTreeStatus', 'ListFiles',
         'LoadChangelistInfoForMultiple', 'MISSING_TEST_MSG',
         'OptionallyDoPresubmitChecks', 'REPOSITORY_ROOT',
         'RunShell', 'RunShellWithReturnCode', 'SVN',
         'TryChange', 'UnknownFiles', 'Warn',
-        'attrs', 'breakpad', 'defer_attributes', 'fix_encoding',
+        'attrs', 'auth', 'breakpad', 'defer_attributes', 'fix_encoding',
         'gclient_utils', 'git_cl', 'json', 'main', 'need_change',
         'need_change_and_args', 'no_args', 'optparse', 'os',
         'presubmit_support', 'random', 're', 'rietveld',
         'ssl', 'string', 'subprocess2', 'sys', 'tempfile', 'time',
         'upload', 'urllib2',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(gcl, members)
 
   def testIsSVNMoved(self):
@@ skipping 495 matching lines @@
     self.assertTrue(change_info._closed)
     self.assertEqual(
         change_info._comments_added,
         ["Committed patchset #1 (id:1337) manually as r12345 (presubmit "
          "successful)."])
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()