I've looked at Catch before. I like it, nice to see that Catch2 is still an ongoing endeavor. It is straightforward and easy to jump in and start using right away.
The single-header-file approach helps to lower the barrier to entry.
(I wouldn't use its BDD style syntax for unit tests. But that's just me, and it's a take-it-or-leave-it, so easy enough to opt-out.)
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