def test_errorDelete(self):
        """
        Test an error during a delete: if key doesn't exist on the server, it
        returns a B{NOT FOUND} answer which calls back the resulting
        L{Deferred} with C{False}.
        """
        return self._test(
            self.proto.delete(b"bar"),
            b"delete bar\r\n", b"NOT FOUND\r\n", False)

        Test an error during a delete: if key doesn't exist on the server, it
        returns a B{NOT FOUND} answer which calls back the resulting
        L{Deferred} with C{False}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_memcache.py