def test_mark_retry(self):
original_packet = packets.AcknowledgementPacket(3)
conversation = TFTPConversation(self.client_host, self.client_port,
StubResponseRouterTwo())
conversation.cached_packet = original_packet
retry_packet = conversation.mark_retry()
self.assertEqual(conversation.retries_made, 1)
self.assertEqual(retry_packet, original_packet)
