def assertIsNone(self, obj, msg=None):
        """Same as self.assertTrue(obj is None), with a nicer default message."""
        if obj is not None:
            standardMsg = '%s is not None' % (safe_repr(obj),)
            self.fail(self._formatMessage(msg, standardMsg))
dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/unittest/case.py/TestCase.assertIsNone/original