def test_emptyGets(self):
        """
        Test getting a non-available key with gets: it succeeds but return
        L{None} as value, C{0} as flag and an empty cas value.
        """
        return self._test(
            self.proto.get(b"foo", True), b"gets foo\r\n",
            b"END\r\n", (0, b"", None))

        Test getting a non-available key with gets: it succeeds but return
        L{None} as value, C{0} as flag and an empty cas value.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_memcache.py