Writing unit tests with Jest

Doing unit testing for RN won't be too much of a surprise, because it happens that we'll be able to reuse most of what we learned before (for example, using Jest also with snapshots, or how to test Redux), except for some small details that must be taken care of, as we'll see.

In this recipe, we'll look at how to set up unit tests for RN, along the lines of what we already did for Node and React.

Getting ready

Whether you create the mobile app with CRAN (as we did) or with react-native init, support for Jest is baked in; otherwise, you'd have to install it on your own, as we saw in the Unit testing your code section of Chapter 5, Testing and Debugging Your Server. Depending...