Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/gyp-defines/gyptest-multiple-values.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Verifies that when multiple values are supplied for a gyp define, the last one
 is used.
 """
 
 import os
 import TestGyp
 
 test = TestGyp.TestGyp()
 
 os.environ['GYP_DEFINES'] = 'key=value1 key=value2 key=value3'
 test.run_gyp('defines.gyp')
+
 test.build('defines.gyp')
 test.must_contain('action.txt', 'value3')
 
 # The last occurrence of a repeated set should take precedence over other
 # values.
 os.environ['GYP_DEFINES'] = 'key=repeated_value key=value1 key=repeated_value'
 test.run_gyp('defines.gyp')
+
 if test.format == 'msvs' and not test.uses_msbuild:
   # msvs versions before 2010 don't detect build rule changes not reflected
   # in file system timestamps. Rebuild to see differences.
   test.build('defines.gyp', rebuild=True)
 elif test.format == 'android':
   # The Android build system doesn't currently have a way to get files whose
   # build rules have changed (but whose timestamps haven't) to be rebuilt.
   # See bug http://code.google.com/p/gyp/issues/detail?id=308
   test.unlink('action.txt')
   test.build('defines.gyp')
 else:
   test.build('defines.gyp')
 test.must_contain('action.txt', 'repeated_value')
 
 test.pass_test()