You know, I quite enjoy TypeScript. It is not my favorite language ever, I am more a functional type of guy, but it is the best way to bring order into the JavaScript mess without too many hassles. Moreover, it is the language in which I prototyped my Astronomical Calendar Generator. Now that I’m working on extending it, I want to keep using TypeScript and stop falling in my usual decision paralysis. Anyway… First thing I needed to do is how to unit test a TypeScript source base. It is easy, but not intuitive. So let’s see how to do it.