unittest: add skipIfGraalPython decorator

Author: cosminbasca

graalpython/lib-python/3/test/test_set.py

@@ -309,7 +309,7 @@ def test_badcmp(self):
             self.assertRaises(RuntimeError, s.discard, BadCmp())
             self.assertRaises(RuntimeError, s.remove, BadCmp())
 
-    @unittest.skipIf(sys.implementation.name == 'graalpython', 'Functionality not yet supported')
+    @unittest.skipIfGraalPython()
     def test_cyclical_repr(self):
         w = ReprWrapper()
         s = self.thetype([w])
@@ -320,7 +320,7 @@ def test_cyclical_repr(self):
             name = repr(s).partition('(')[0]    # strip class name
             self.assertEqual(repr(s), '%s({%s(...)})' % (name, name))
 
-    @unittest.skipIf(sys.implementation.name == 'graalpython', 'Functionality not yet supported')
+    @unittest.skipIfGraalPython()
     def test_cyclical_print(self):
         w = ReprWrapper()
         s = self.thetype([w])

graalpython/lib-python/3/unittest/__init__.py

@@ -43,6 +43,7 @@ def testMultiply(self):
 AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
 SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 """
+import sys
 
 __all__ = ['TestResult', 'TestCase', 'TestSuite',
            'TextTestRunner', 'TestLoader', 'FunctionTestCase', 'main',
@@ -76,3 +77,7 @@ def load_tests(loader, tests, pattern):
     # top level directory cached on loader instance
     this_dir = os.path.dirname(__file__)
     return loader.discover(start_dir=this_dir, pattern=pattern)
+
+
+def skipIfGraalPython():
+    return skipIf(sys.implementation.name == 'graalpython', 'Functionality not yet supported')