catchorg/Catch2
A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)
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Worth your time
rules reportOutside contributors get real replies here, and their work gets merged.
30 of 118outside PRs merged (25%)
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