def filter(self, delegate, args=None):
        self.delegate = delegate
        self.filterCalls.append(args)
        self.deferred = defer.Deferred()
        return self.deferred
Returns the deferred, which can be fired in tests at will.
dataset/ETHPy150Open dustin/twitty-twister/twittytwister/test/test_twitter.py/FakeTwitterAPI.filter