tests/unittests: add test for bit.h

[benpicco]

Contribution description

This adds unit tests for the functions from bit.h

Testing procedure

Just run make -C tests/unittests tests-bit

Issues/PRs references

depends on #21705

[crasbe]

Perhaps you can add a small piece of documentation somewhere explaining what the tests do (except testing bit.h 😅 ).

[riot-ci]

Murdock results

✔️ PASSED

ac34cc7 tests/unittests: add test for bit.h

Success	Failures	Total	Runtime
10509	0	10513	13m:29s

Artifacts

• Documentation preview

[miri64]

For some reason the job was stopped https://ci.riot-os.org/details/dc221b39e0a944ea9d9bfd353c3514c8

[Teufelchen1]

@benpicco are you aware of the compilation errors in application "tests_unittests" for "frdm-kl43z" (via murdock)?

[elenaf9]

@benpicco are you aware of the compilation errors in application "tests_unittests" for "frdm-kl43z" (via murdock)?

I think it's because of #21705, which adds the bit_check_XX functions for the kinetis bme. Right now they don't exist in the bme, and this PR uses them.
In the meantime, however, #21750 has disabled the use of bme temporarily, so it shouldn't be an issue right now that the functions are missing there. I think this PR just needs to be rebased onto current master? (Unless murdock does that already before executing the tests, then I don't know...)

[benpicco]

Murdock already does the rebase before doing the build.