FCTX is an easy-to-use unit test tool for C programs. It comes from http://fctx.wildbearsoftware.com/ but that site has been broken for a while, so I am replicating the software here.
Pandokia contains the key files needed to compile and run tests written for FCTX. If you will use Pandokia for testing, you don't need to install anything else to use FCTX. Just write your test according to the API in the documentation.
Complete source code for FCTX is on github.