testConnectToSelf failing about distributed-process HOT 2 CLOSED

The reason the test fails when you add another call to connect is that the endpoint will receive two ConnectionOpened messages before it gets the first Received message. So the error you are seeing is an error in your test, not in the transport. The latest version of the transport gives more detailed feedback when a test fails. With your modification (the second call to connect) the test now fails with

Running "ConnectToSelf": failed (exception: user error 
    (Pattern match failure in do expression at tests/TestTransport.hs:460:8-29)
Trace:
0   ConnectionOpened 1025 ReliableOrdered (EndPointAddress {endPointAddressToByteString = "127.0.0.1:8080:19"})
1   ConnectionOpened 1024 ReliableOrdered (EndPointAddress {endPointAddressToByteString = "127.0.0.1:8080:19"})
)

which very clearly shows what's going on: the test was expecting a Received message on line 460 but instead got a ConnectionOpened message.

from distributed-process.

Quite right.

Thanks for clarifying!

from distributed-process.