def test_callRemoteStringRequiresAnswerFalse(self):
        """
        L{BoxDispatcher.callRemoteString} returns L{None} if C{requiresAnswer}
        is C{False}.
        """
        c, s, p = connectedServerAndClient()
        ret = c.callRemoteString(b"WTF", requiresAnswer=False)
        self.assertIsNone(ret)

        L{BoxDispatcher.callRemoteString} returns L{None} if C{requiresAnswer}
        is C{False}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_amp.py