'Fake L{IReactorUNIX.listenUNIX}, that logs the call and returns an
L{IListeningPort}.'

def listenUNIX(self, address, factory, backlog=50, mode=438, wantPID=0):

    self.unixServers.append((address, factory, backlog, mode, wantPID))
    return _FakePort(UNIXAddress(address))
