def test_identity(self):
        """
        Instances of a class which mixes in L{FancyEqMixin} but which
        defines no comparison attributes compare by identity.
        """
        class Empty(util.FancyEqMixin):
            pass

        self.assertFalse(Empty() == Empty())
        self.assertTrue(Empty() != Empty())
        empty = Empty()
        self.assertTrue(empty in empty)
        self.assertFalse(empty != empty)
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/test/test_util.py/EqualityTests.test_identity/operator `==` -> `in`