You're right that assertion messages could be more helpful, that's why I didn't close the issue :P You'll have to get used to printing stuff - many translations are similar like this one, and there's little effort to fix them.

But there is no test with this string and empty part1, part2 (and obviously it wouldn't expect true). I don't see a problem with debugging here, simply print the input to Console and debug locally, if necessary. See https://docs.codewars.com/training/troubleshooting/#print-input