def setUp(self):
        """
        Create a disconnected memcache client, using a deterministic clock.
        """
        self.proto = MemCacheProtocol()
        self.clock = Clock()
        self.proto.callLater = self.clock.callLater
        self.transport = StringTransportWithDisconnection()
        self.transport.protocol = self.proto
        self.proto.makeConnection(self.transport)
        self.transport.loseConnection()

        Create a disconnected memcache client, using a deterministic clock.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_memcache.py