def test_callLaterOrdering(self):
        """
        Test that the DelayedCall returned is not one previously
        created.
        """
        c = task.Clock()
        call1 = c.callLater(10, lambda a, b: None, 1, b=2)
        call2 = c.callLater(1, lambda a, b: None, 3, b=4)
        self.assertFalse(call1 is call2)

        Test that the DelayedCall returned is not one previously
        created.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_task.py