those sleeps cannot be easily included in the code, as they simulate 2...

those sleeps cannot be easily included in the code, as they simulate 2 participants on 2 different computers.
Increase the timeouts from 1000 -> 3000 ms if there are some internal messages send (e.g. network_a closed, send on stream_a)
Increase the timeouts from 1000 -> 5000 ms if there is actuall networking involed (e.g. stream_a send, stream_b recv)