cmocka is an elegant unit testing framework for C with support for mock objects. It only requires the standard C library, works on a range of computing platforms (including embedded) and with different compilers.
For information about how to use the cmocka unit testing framework see doc/index.html or https://api.cmocka.org/.
To compile the cmocka library and example applications run, create a build dir, and in the build dir call 'cmake /path/to/cmocka' followed by 'make'. On Windows you can use the cmake gui. More details can be found in the INSTALL file.