I didn't realize the power of Jest (and how it made everything easy to use) till I decided to re-create the functionality with Mocha (and nyc for coverage). To

I didn't realize the power of Jest (and how it made everything easy to use) till I decided to re-create the functionality with Mocha (and nyc for coverage). Took me almost half a day to an half-assed port of sorts of such an awesome tool. (the reason I used Mocha was because it was already a dep for my integration testing and I didn't want to introduce Jest - in the end - I introduced jsdom, enzyme and nyc as well)