def test_stopTryingDoesNotReconnect(self):
        """
        Calling stopTrying on a L{ReconnectingClientFactory} doesn't attempt a
        retry on any active connector.
        """
        class FactoryAwareFakeConnector(FakeConnector):
            attemptedRetry = False

            def stopConnecting(self):
                """
                Behave as though an ongoing connection attempt has now
                failed, and notify the factory of this.
                """
                f.clientConnectionFailed(self, None)

            def connect(self):
                """
                Record an attempt to reconnect, since this is what we
                are trying to avoid.
                """
                self.attemptedRetry = True

        f = ReconnectingClientFactory()
        f.clock = Clock()

        # simulate an active connection - stopConnecting on this connector should
        # be triggered when we call stopTrying
        f.connector = FactoryAwareFakeConnector()
        f.stopTrying()

        # make sure we never attempted to retry
        self.assertFalse(f.connector.attemptedRetry)
        self.assertFalse(f.clock.getDelayedCalls())

        Calling stopTrying on a L{ReconnectingClientFactory} doesn't attempt a
        retry on any active connector.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_factories.py