Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/mac/gyptest-copies.py

Index: test/mac/gyptest-copies.py
diff --git a/test/mac/gyptest-copies.py b/test/mac/gyptest-copies.py
index c88065eade585227e8f2f1a4094422795f9cf7ba..88cc110580de0cb1439d49e46cfb95bc4b4c4719 100755
--- a/test/mac/gyptest-copies.py
+++ b/test/mac/gyptest-copies.py
@@ -17,7 +17,9 @@ import time
 if sys.platform == 'darwin':
   test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
 
-  test.run_gyp('framework.gyp', chdir='framework')
+  test.run_gyp('framework.gyp',
+               '-G', 'xcode_ninja_target_pattern=^copy_target$',
+               chdir='framework')
 
   test.build('framework.gyp', 'copy_target', chdir='framework')