def test_receive_sack_discard(self):
client_transport, _ = dummy_dtls_transport_pair()
client = RTCSctpTransport(client_transport)
client._last_received_tsn = 0
# receive sack
sack_point = client._last_sacked_tsn
chunk = SackChunk()
chunk.cumulative_tsn = tsn_minus_one(sack_point)
run(client._receive_chunk(chunk))
# sack point must not changed
self.assertEqual(client._last_sacked_tsn, sack_point)
def test_receive_shutdown(self):
async def mock_send_chunk(chunk):
pass
client_transport, _ = dummy_dtls_transport_pair()
client = RTCSctpTransport(client_transport)
client._last_received_tsn = 0
client._send_chunk = mock_send_chunk
client.state = RTCSctpTransport.State.ESTABLISHED
# receive shutdown
chunk = ShutdownChunk()
chunk.cumulative_tsn = tsn_minus_one(client._last_sacked_tsn)
run(client._receive_chunk(chunk))
self.assertEqual(client.state,
RTCSctpTransport.State.SHUTDOWN_ACK_SENT)
# receive shutdown complete
chunk = ShutdownCompleteChunk()
run(client._receive_chunk(chunk))
self.assertEqual(client.state, RTCSctpTransport.State.CLOSED)
def test_tsn_minus_one(self):
self.assertEqual(tsn_minus_one(0), 4294967295)
self.assertEqual(tsn_minus_one(1), 0)
self.assertEqual(tsn_minus_one(4294967294), 4294967293)
self.assertEqual(tsn_minus_one(4294967295), 4294967294)