This website pulse.appsscript.info/p/2022/05/simple-but-powerful-apps-script-unit-test-library-desktop-liberation/ is currently offline. Cloudflare's Always Online™ shows a snapshot of this web page from the Internet Archive's Wayback Machine. To check for the live version, click Refresh.
Unit testing your code with this Apps Script Unit test library as you go along will makes it easy to immediately catch errors, and keeping a running test repertoire ensures that you don’t break anything.
When you start developing more complex Google Workspace solutions like add-ons and Chat apps it’s worth considering how you will test, debug and refactor your code. As noted in this post from Bruce Mcpherson the Apps Script community has published a number of different solutions/approaches to unit tests, a number of these appearing in Pulse. This latest post from Bruce looks at the bmUnitTest library he has developed highlighting how it can be set up and used.