def test_getMultipleWithEmpty(self):
        """
        When L{MemCacheProtocol.getMultiple} is called with non-available keys,
        the corresponding tuples are (0, None).
        """
        return self._test(
            self.proto.getMultiple([b'foo', b'cow']),
            b"get foo cow\r\n",
            b"VALUE cow 1 3\r\nbar\r\nEND\r\n",
            {b'cow': (1, b'bar'), b'foo': (0, None)})

        When L{MemCacheProtocol.getMultiple} is called with non-available keys,
        the corresponding tuples are (0, None).
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_memcache.py