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Catch
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)
It was not easy, I had to modify Boost UT to get it to run my tests. It doesn't support type-parametrized tests when the type parameter is non-copiable, which was the case for me. This is a symptom of a larger issue, which is that it relies on std::apply and std::tuple to generate the type-parametrized tests, which in turns requires instantiating the tuple and the contained objects (even though these instances aren't actually used; eh). That's a no go for me, since I need to carefully monitor when instance are created, and this was throwing off my test code. I had to effectively disable these checks to get it to run without failures. Then there was a similar issue with expect(), which doesn't work if part of the expression is non-copiable. I reported these issues to them.
Author here! This testing framework is meant to have a very small footprint, in terms of compilation time, executable size, and runtime, but still be super easy to use and able to print nicely presented messages when assertions fail. It was modeled after Catch2, and reproduces its convenient REQUIRE(expr) and CHECK(expr) assertion macros.
I initially created this library to test another library of mine (observable_unique_ptr). I had been using Catch2 so far, and was reasonably happy with it, but ended up hitting a number of issues.