Add TestGypXcodeNinja to run tests against the xcode-ninja generator

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

Index: test/gyp-defines/gyptest-multiple-values.py
diff --git a/test/gyp-defines/gyptest-multiple-values.py b/test/gyp-defines/gyptest-multiple-values.py
index 7c38257582be57b59b2f6f1525e36d6dbf799c59..6764dbd545dcdc6055e5739f52770df9ae895818 100644
--- a/test/gyp-defines/gyptest-multiple-values.py
+++ b/test/gyp-defines/gyptest-multiple-values.py
@@ -16,6 +16,7 @@ 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')
 
@@ -23,6 +24,7 @@ test.must_contain('action.txt', 'value3')
 # 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.