I was just about to suggest doctest, you beat me to it! I'm all about faster compile times, and it was mostly a drop-in replacement for catch2 in my case.
Also, IMO, both doctest and catch2 are far superior to Google Test.
>catch2 has become fairly bloated. doctest takes all of the best parts of catch2 without all the bloat and the end result is a test framework that is literally over 10x faster than catch2. It's also like 90% compatible with catch2 so porting your tests to it is pretty easy.
I feel like you could make a madlib where you could plug in any two project names and this sentence would make sense.
Madlibs have become fairly bloated. Copypasta memes take all the best parts of madlibs without all the bloat and the end result is a form of mockery is literally over 10x faster than a madlib. It's also like 90% compatible with madlibs so porting your gibes is pretty easy.
Especially if you have a build process that always runs your unit tests, it's nice to have a very fast test/compile/debug loop.
https://github.com/doctest/doctest