In the kernel with have selftests, which are basically just regular binaries run by make. I didn't do a lot of C unit testing before I started writing selftests

In the kernel with have selftests, which are basically just regular binaries run by make. I didn't do a lot of C unit testing before I started writing selftests, but now I don't see a reason not to, I just made my own little version of the selftest makefile and use that. C code can be tested like any other code it's just made more difficult by the fact that most C code is very concrete and doing systemy things that are harder to isolate.