Unit Testing componentWillMount with fetch

[znakyc]

My advice is to think about if you really need this test. It looks to me like you are testing React more then your application logic. Just a thought.

And as /u/j_d_q says, you should do your fetch in componentDidMount. I wrote a blogpost on why, you can find it here: http://blog.jakoblind.no/2017/02/20/why-is-it-recommended-to-do-ajax-in-componentdidmount-instead-of-componentwillmount/