Ask HN: What is the best resource to learn how to test ReactJS?

So, I have a big problem: I'm pretty good with react+redux, but I never learned how to test(and never tested in any other language before) and in my new job they told me that they will fire me if I don't learn :( (I totally understand their point) I want really study hard and learn, but I don't find any good book on this subject.

I'm interested to learn jest, snapshots, mock requests etc (and how test with react-router/redux) The problem is that the jest documentation lack of complex examples and I don't understand how I should test a large app.

Any resource is very welcome and appreciated(even blogs/tutorials/videos/books etc...)