Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/mac/gyptest-rpath.py

Index: test/mac/gyptest-rpath.py
diff --git a/test/mac/gyptest-rpath.py b/test/mac/gyptest-rpath.py
index 2440d548e639112ff35f93ac1d297cc0a55f7f1c..b1c38e3caffcb17c264f301e0b85c8eed21e5fa8 100644
--- a/test/mac/gyptest-rpath.py
+++ b/test/mac/gyptest-rpath.py
@@ -19,7 +19,10 @@ if sys.platform == 'darwin':
   test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
 
   CHDIR = 'rpath'
-  test.run_gyp('test.gyp', chdir=CHDIR)
+  test.run_gyp('test.gyp',
+               '-G', 'xcode_ninja_target_pattern=^.*$',
+               chdir=CHDIR)
+
   test.build('test.gyp', test.ALL, chdir=CHDIR)
 
   def GetRpaths(p):