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Asked: 2026-06-09T05:26:59+00:00

I have two gen_servers that communicate using gen_tcp sockets. The first gen_server exports a

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I have two gen_servers that communicate using gen_tcp sockets.

The first gen_server exports a function, that when called builds (calling another function) a RFC 791 packet, connects to a socket where the other gen_server is listening for incoming connections, and sends the packet to it.

I tested this in the shell and it is working, but what would be the right tool/way to test such a code? Should I use eunit or or is there any other tool more suitable?

Moreover I would like to know what should I actually test? Only the sending part or also function for packet construction?

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  1. Editorial Team

    You can definitely write some EUnit tests for every gen_servers:

    http://www.erlang.org/doc/apps/eunit/chapter.html

    http://learnyousomeerlang.com/eunit#the-need-for-tests

    You can also have a look at Common Test to test the interaction:

    http://www.erlang.org/doc/apps/common_test/basics_chapter.html

    http://learnyousomeerlang.com/common-test-for-uncommon-tests#what-is-common-test

    Since your implementation strongly depends on the data passed, I would have a look to generators provided by QuickCheck Mini or PropEr:

    http://www.quviq.com/

    http://proper.softlab.ntua.gr/

    A brief explaination on how you can improve your unit tests with something like QuickCheck mini is available here:

    http://www.erlang-solutions.com/upload/docs/85/EUG-London-Apr2011.pdf

    As a start, I would focus on testing the functions you export (the module interface). You can still add more tests later.

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