The https://github.com/magnars/kaocha-runner.el looks a useful way to run kaocha from within Emacs. A nice alternative to using cider-test, as Koacha seems a little faster to run too (although I havent extensively tested this). I assume the fail-fast and incremental testing helps. Any caveats when using kaocha-runner.el (on top of the usual cider-test ones)? I've raised https://github.com/syl20bnr/spacemacs/issues/15267 to add this to spacemacs (I'll do a PR later today)