def test_flushAll(self):
        """
        L{MemCacheProtocol.flushAll} returns a L{Deferred} which is called back
        with C{True} if the server acknowledges success.
        """
        return self._test(
            self.proto.flushAll(), b"flush_all\r\n", b"OK\r\n", True)

        L{MemCacheProtocol.flushAll} returns a L{Deferred} which is called back
        with C{True} if the server acknowledges success.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_memcache.py