FYI, I have some work in progress on unit tests in this repo:
there is a lot more to do on that front, but if you want to be notified of progress on my work on this, you could subscribe to the ticket I have for it:
Hope that we can come up with something good…
I also have some GitHub Actions for standard stuff like Joe Mooring’s audit, HTML validation, and checking internal link (or periodically checking external links, fairly strictly (e.g. 301 will throw an error and complain that the link needs to be updated), which I can provide links if they are of interest, and you don’t already have them, or something like them.