def test_noTimeoutIfConnectionLost(self):
        """
        When a L{H2Connection} loses its connection it cancels its timeout.
        """
        frameFactory = FrameFactory()
        frames = buildRequestFrames(self.getRequestHeaders, [], frameFactory)
        initialData = frameFactory.clientConnectionPreface()
        initialData += b''.join(f.serialize() for f in frames)

        reactor, conn, transport = self.initiateH2Connection(
            initialData, requestFactory=DummyProducerHandler,
        )

        sentData = transport.value()
        oldCallCount = len(reactor.getDelayedCalls())

        # Now lose the connection.
        conn.connectionLost("reason")

        # There should be one fewer call than there was.
        currentCallCount = len(reactor.getDelayedCalls())
        self.assertEqual(oldCallCount - 1, currentCallCount)

        # Advancing the clock should do nothing.
        reactor.advance(101)
        self.assertEqual(transport.value(), sentData)

        When a L{H2Connection} loses its connection it cancels its timeout.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_http2.py