Which open-source C++ projects have good (inspiring) tests? [closed]

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What are inspiring examples of open-source software written in C++ with great tests?

I would like to read, study and follow.

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I like mysql's exhaustive test suite, where they add a test for almost every bug they fix to prevent regressions.

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I have not read the source code, but PHP have a lot of tests which kan be easily run by make test after compilation.