Notes

Jest is full of niceties. Today I've discovered it.failing. It's for writing tests that are expected to fail.

Sometimes you're working on a particular test and don't want to run other specs. You run your tests adding a path pattern parameter, but you're not interested on the rest of the spec also. On these situations, I used to comment all other tests, but then I discovered the .only "modifier". You can append to describe and it to restrict what should be ran. You can even dismiss the path param.

In Jest, the difference between toEqual and toMatchObject is that toEqual checks for total equality, while toMatchObject checks for a partial match. This post is a good ref.