How do you unit-test a TCP Server? Is it even worth it?

Question

I\'m developing a small TCP server, which will process some TCP packets and behave differently based on the request.

How can I write unit test for this? If it\'s really

Answer 1

The first thing to do is to separate the behavior(s) from the TCP packets that are incoming. Abstract that into a dispatch table or other such thing.

Then write unit tests for each of the behaviors independent of how they were invoked. You can test the final TCP -> behavior layer with a test tool you write or borrow. That layer should be almost trivial if the code is factored properly.