def test_queryTimeout(self):
        """
        Test that query timeouts after some seconds.
        """
        d = self.proto.query(('127.0.0.1', 21345), [dns.Query(b'foo')])
        self.assertEqual(len(self.proto.liveMessages), 1)
        self.clock.advance(10)
        self.assertFailure(d, dns.DNSQueryTimeoutError)
        self.assertEqual(len(self.proto.liveMessages), 0)
        return d

        Test that query timeouts after some seconds.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/names/test/test_dns.py