def test_decrementVal(self):
        """
        L{MemCacheProtocol.decrement} takes an optional argument C{value} which
        replaces the default value of 1 when specified.
        """
        return self._test(
            self.proto.decrement(b"foo", 3), b"decr foo 3\r\n", b"5\r\n", 5)

        L{MemCacheProtocol.decrement} takes an optional argument C{value} which
        replaces the default value of 1 when specified.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_memcache.py