Add a new variable environment for testing, to replace the misusage of 'arch'.

dart/tools/make_bundle.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 """Tool for automating creation of a Dart bundle."""
 
 import optparse
@@ skipping 13 matching lines @@
     self._top_dir = top_dir
     self._dest = dest
     self._verbose = verbose
     self._skip_build = skip_build
     self._os = utils.GuessOS()
     self._release_build_root = utils.GetBuildRoot(self._os, mode='release',
                                                   arch='ia32')
     self._debug_build_root = utils.GetBuildRoot(self._os, mode='debug',
                                                 arch='ia32')
     self._dartc_build_root = utils.GetBuildRoot(self._os, mode='release',
-                                                arch='dartc')
+                                                FOOBAR='dartc')
 
   @staticmethod
   def BuildOptions():
     """Make an option parser with the options supported by this tool.
 
     Returns:
       A newly created OptionParser.
     """
     op = optparse.OptionParser('usage: %prog [options]')
     op.add_option('-d', '--dest')
@@ skipping 175 matching lines @@
   try:
     op = BundleMaker.BuildOptions()
     options = BundleMaker.CheckOptions(op, top_dir, cmd_line_args)
   except utils.Error:
     return 1
   sys.exit(BundleMaker(**options).MakeBundle())
 
 
 if __name__ == '__main__':
   main()