testutil.py

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class FakeTransport(object):
    _written = b""
    _open = True

    def __init__(self):
        self._abort_calls = []

    def abortConnection(self, *args, **kw):
        self._abort_calls.append((args, kw))

    def write(self, msg):
        if not self._open:
            raise Exception("Can't write to a closed connection")
        self._written = self._written + msg

    def loseConnection(self):
        self._open = False

    def registerProducer(self, producer, streaming):
        # https://twistedmatrix.com/documents/current/api/twisted.internet.interfaces.IConsumer.html
        raise NotImplementedError

    def unregisterProducer(self):
        # do nothing is correct! until we fake implement registerProducer ..;)
        pass

    def getPeer(self):
        # for Twisted, this would be an IAddress
        class _FakePeer(object):
            pass
        return _FakePeer()

    def getHost(self):
        # for Twisted, this would be an IAddress
        class _FakeHost(object):
            pass
        return _FakeHost()

    def abort_called(self):
        return len(self._abort_calls) > 0