Using TEST_F to test C function

[nckuoverload]

Hi all,
I'm a newer in gtest and want to test lot of C based modules (target.c) by gtest.
After study related tutorial, I try to use TEST_F() to build the test case, but it seems only support C++ based function.
So, if I want to build test case for C based, only TEST() can achieve it?

Please give me some recommendation, solution or tutorials to try it, thanks.