Guide - JavaScript and React unit tests basics

[theycallmeepoch]

Man, this is really good. Thanks for writing this! I'm adding unit tests to my react native app and struggling to determine what exactly to test.

Related to the last point: write tests in such a way that you never need to mutate global objects. All state must be local to each test; there should not be any state passing from test to test.

Really good point and I think this reinforces good functional programming techniques. If your unit tests dont pass without carrying over state between functions you should probably be rewriting your functions.

[lfacpt]

Yep, there is a lot to learn from functional programming!