[libc-commits] [libc] [libc][test] adds errno clearer test fixture, gtest-style errno and fp except assertions (PR #91608)

[Michael Flanders via libc-commits]

Flandini wrote:

> LGTM on a first pass, I need to do a bit more research on the gtest API before I can confidently approve.

Like the other matchers we have, the matchers added in this PR does not match the gtest API on the matchers, and the rest is macros around expect/assert macros that I believe are all compatible with the gtest API. I started working on a separate PR to change the other matchers to use the gtest API, and can circle back to these matchers or have this PR wait til the other is in, up to y'all.

https://github.com/llvm/llvm-project/pull/91608