def test_absent_option_echo_request(self):
        relayed_solicit_message = RelayForwardMessage(
            hop_count=1,
            link_address=IPv6Address('2001:db8:ffff:1::1'),
            peer_address=IPv6Address('fe80::3631:c4ff:fe3c:b2f1'),
            options=[
                RelayMessageOption(relayed_message=SolicitMessage(
                    transaction_id=bytes.fromhex('f350d6'),
                    options=[
                        ElapsedTimeOption(elapsed_time=0),
                        ClientIdOption(duid=LinkLayerDUID(hardware_type=1,
                                                          link_layer_address=bytes.fromhex('3431c43cb2f1'))),
                        IANAOption(iaid=bytes.fromhex('c43cb2f1')),
                    ],
                )),
                EchoRequestOption(requested_options=[OPTION_SUBSCRIBER_ID]),
                UnknownOption(option_type=65535),
                InterfaceIdOption(interface_id=b'Fa2/3'),
                RemoteIdOption(enterprise_number=9,
                               remote_id=bytes.fromhex('020023000001000a0003000100211c7d486e')),
            ]
        )

        bundle = TransactionBundle(incoming_message=relayed_solicit_message, received_over_multicast=True)
        self.message_handler.handle(bundle, StatisticsSet())

        self.assertIsInstance(bundle.outgoing_message, RelayReplyMessage)
        self.assertEqual(len(bundle.outgoing_message.options), 2)
        self.assertIsInstance(bundle.outgoing_message.options[0], InterfaceIdOption)
        self.assertIsInstance(bundle.outgoing_message.options[1], RelayMessageOption)
 def test_bad_option_length(self):
     with self.assertRaisesRegex(ValueError, 'Invalid option length'):
         EchoRequestOption.parse(bytes.fromhex('002b000300030004'))
 def setUp(self):
     self.option_bytes = bytes.fromhex('002b0006004f0026ffff')
     self.option_object = EchoRequestOption(requested_options=[
         OPTION_CLIENT_LINKLAYER_ADDR, OPTION_SUBSCRIBER_ID, 65535
     ])
     self.parse_option()