Testing library for C code

[Przemysław Wojnowski]

Hello everybody,

I'm looking at libraries for testing C code and I'm wondering
if it's acceptable to use C++ to write the tests for Emacs' C code?

Simply there are more choices when C++ can be used (for example 
googletest, cppunit).
But if not, then there are C-only options too (for example 
https://cmocka.org/).

The important part is breaking dependencies, which allow
to run tests in isolation. Mocks are standard way do do it.

Thanks,
Przemysław