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..e0a149a0f093a788e6fad91fd5d6e2014402cc03 100644
--- a/test/gyp-defines/gyptest-multiple-values.py
+++ b/test/gyp-defines/gyptest-multiple-values.py
@@ -15,14 +15,18 @@ import TestGyp
 test = TestGyp.TestGyp()
 
 os.environ['GYP_DEFINES'] = 'key=value1 key=value2 key=value3'
-test.run_gyp('defines.gyp')
+test.run_gyp('defines.gyp',
+             '-G', 'xcode_ninja_target_pattern=^test_target$')
+
 test.build('defines.gyp')
 test.must_contain('action.txt', 'value3')
 
 # The last occurrence of a repeated set should take precedence over other
 # values.
 os.environ['GYP_DEFINES'] = 'key=repeated_value key=value1 key=repeated_value'
-test.run_gyp('defines.gyp')
+test.run_gyp('defines.gyp',
+             '-G', 'xcode_ninja_target_pattern=^test_target$')
+
 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.