Add mini_installer not-in-use update test.

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 326 matching lines @@
                       help='Name(s) of tests to run.')
   args = parser.parse_args()
   if not args.config:
     parser.error('missing mandatory --config FILENAME argument')
 
   mini_installer_path = os.path.join(args.build_dir, args.target,
                                      'mini_installer.exe')
   assert os.path.exists(mini_installer_path), ('Could not find file %s' %
                                                mini_installer_path)
 
+  next_version_mini_installer_path = os.path.join(
+      args.build_dir, args.target, 'next_version_mini_installer.exe')
+  assert os.path.exists(next_version_mini_installer_path), (
+      'Could not find file %s' % next_version_mini_installer_path)
+
   suite = unittest.TestSuite()
 
   # Set the env var used by mini_installer.exe to decide to not show UI.
   os.environ['MINI_INSTALLER_TEST'] = '1'
 
-  variable_expander = VariableExpander(mini_installer_path)
+  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__,
                               InstallerTest.__name__,
                               test['name'])
     if not args.test or test_name in args.test:
       suite.addTest(InstallerTest(test['name'], test['traversal'], config,
@@ skipping 70 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())