Test NO-OP paths for packet acks, `RecvPacket` and timeouts

[plafer]

This path for example (and analogous paths for acks and RecvPacket), test that event is emitted properly, and no state change is applied.

[plafer]

#430 implements all tests except for RecvPacket

[rnbguy]

@Farhad-Shabani am I correct to assume we need a test for already submitted packets and make sure there was no change in the state?

As plafer commented, the other tests should be present already.