def test_lateAnswer(self):
        """
        Verify that a command that does not get answered until after the
        connection terminates will not cause any errors.
        """
        c, s, p = connectedServerAndClient(
            ServerClass=SimpleSymmetricCommandProtocol,
            ClientClass=SimpleSymmetricCommandProtocol)
        L = []
        c.callRemote(WaitForever).addErrback(L.append)
        p.flush()
        self.assertEqual(L, [])
        s.transport.loseConnection()
        p.flush()
        L.pop().trap(error.ConnectionDone)
        # Just make sure that it doesn't error...
        s.waiting.callback({})
        return s.waiting

        Verify that a command that does not get answered until after the
        connection terminates will not cause any errors.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_amp.py