[libcxx-commits] [libcxx] [libc++] Refactor the std::unique_lock tests (PR #102151)

[Louis Dionne via libcxx-commits]

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ldionne wrote:

Can you please add a basic test that ensures that `std::unique_lock<std::mutex>` works properly? We used to test that implicitly via other tests, but that's not the case anymore so we should have something that ensures basic interoperability.

https://github.com/llvm/llvm-project/pull/102151