Summary

Testing is crucial to the successful deployment of an application product into production. In this chapter, we examined various testing types available, especially unit testing for code base quality and ease of maintainability. This ensures a lower cost of producing software with confidence.

We also explored Jest, a Node test runner that delightfully tests JavaScript code and, by extension, React applications. The Jest testing framework ensures that you work in an integrated testing environment, with virtually all your testing tools in one place and only a stone’s throw away.

We discussed RTL with its implementation and then, in depth, the unit testing of React components using Jest and RTL, which comes with the Create React App (CRA) boilerplate code.

We wrote useful component tests to showcase the ability of the combined tools of Jest and TLR. Finally, we discussed a testing methodology, TDD, in software development and how it can be used in React-based applications...