Back in 2013, someone had the great idea of forking the JavaScript testing library QUnit and updating it to work with Google Apps Script. However, no (public) work has been done on it since and it is stuck with v1.12 of QUnit.  

Well, hold the presses … Andrew Roberts and Alejo Grigera Sutro have now brought the Apps Script library kicking and screaming back into the 21st century with QUnitGS2, using the very latest v2.10.1 of QUnit.

Check it out at the website or jump straight in with this quick start guide.

Enjoy!