First unit test for the server

I have written a Junit test for the server distribution functionality (DistributionTest). It has been quite easy after decoupling work done before.
First test simply connects a session to the server.
Second test tries to connect two sessions and subscribe both of them to all incoming messages (using regex pattern ".*"). Then, it sends one message from each session and excepts it to be received by both. This tests shows (it actually fails for now) that it is necessary to have a way to acknowledge the completion of subscription ("REC" command). Test needs it to know when to proceed with sending messages, so would many applications do.