Hello,

I am currently writing some test cases to contribute to libc-test.
In regards to reusing common macros and function stubs, where would
be the most appropriate place to put these? Should these be added
to `test.h`? Would a new `utils.h` header file be more appropriate?
A new file would ensure no rework/unexpected redefines with already
existing tests. Or should the macros needed for a given test be
defined within that test file, even if many tests use the same
macros. For example #define TEST(c, ...).

Kind regards,
Ryan