def filter(self, delegate, args=None):
        self.delegate = delegate
        self.filterCalls.append(args)
        self.deferred = defer.Deferred()
        return self.deferred
Test that subscribing as second results in a notification being sent.
dataset/ETHPy150Open dustin/twitty-twister/twittytwister/test/test_twitter.py/FakeTwitterAPI.filter--crossover with--dataset/ETHPy150Open ralphm/idavoll/idavoll/test/test_gateway.py/GatewayTest.test_subscribeGetDelayedNotification2