Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/ninja/empty-and-non-empty-duplicate-name/gyptest-empty-and-non-empty-duplicate-name.py

 #!/usr/bin/env python
 
 # Copyright (c) 2014 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 a phony target isn't output if a target exists with the same name that
 was output.
 """
 
 import TestGyp
 
 test = TestGyp.TestGyp(formats=['ninja'])
 
-test.run_gyp('test.gyp')
+# Reset xcode_ninja_target_pattern to its default for this test.
+test.run_gyp('test.gyp', '-G', 'xcode_ninja_target_pattern=^$')
 
 # Check for both \r and \n to cover both windows and linux.
 test.must_not_contain('out/Default/build.ninja', 'build empty_target: phony\r')
 test.must_not_contain('out/Default/build.ninja', 'build empty_target: phony\n')
 
 test.pass_test()