Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/mac/gyptest-libraries.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 libraries (in link_settings) are properly found.
 """
 
 import TestGyp
 
 import sys
 
 if sys.platform == 'darwin':
   test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
 
+  # The xcode-ninja generator handles gypfiles which are not at the
+  # project root incorrectly.
+  # cf. https://code.google.com/p/gyp/issues/detail?id=460
+  if test.format == 'xcode-ninja':
+    test.skip_test()
+
   test.run_gyp('subdir/test.gyp', chdir='libraries')
 
   test.build('subdir/test.gyp', test.ALL, chdir='libraries')
 
   test.pass_test()