Fix interpretation of tests specified on the command line.

chrome/test/mini_installer/test_installer.py

 # Copyright 2013 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.
 
 """This script tests the installer with test cases specified in the config file.
 
 For each test case, it checks that the machine states after the execution of
 each command match the expected machine states. For more details, take a look at
 the design documentation at http://goo.gl/Q0rGM6
 """
@@ skipping 346 matching lines @@
 
   suite = unittest.TestSuite()
 
   variable_expander = VariableExpander(mini_installer_path,
                                        next_version_mini_installer_path)
   config = ParseConfigFile(args.config, variable_expander)
 
   RunCleanCommand(args.force_clean, variable_expander)
   for test in config.tests:
     # If tests were specified via |tests|, their names are formatted like so:
-    test_name = '%s/%s/%s' % (InstallerTest.__module__,
+    test_name = '%s.%s.%s' % (InstallerTest.__module__,
                               InstallerTest.__name__,
                               test['name'])
     if not args.test or test_name in args.test:
       suite.addTest(InstallerTest(test['name'], test['traversal'], config,
                                   variable_expander, args.quiet))
 
   verbosity = 2 if not args.quiet else 1
   result = unittest.TextTestRunner(verbosity=verbosity).run(suite)
   if args.write_full_results_to:
     with open(args.write_full_results_to, 'w') as fp:
@@ skipping 64 matching lines @@
     trie[path] = value
     return
   directory, rest = path.split(TEST_SEPARATOR, 1)
   if directory not in trie:
     trie[directory] = {}
   _AddPathToTrie(trie[directory], rest, value)
 
 
 if __name__ == '__main__':
   sys.exit(main())