In this chapter, we've seen how to write unit, integration, and end-to-end tests using some of the most popular libraries and test runners out there, such as Cypress, Jest, and react-testing-library.
As mentioned multiple times during the chapter, testing is essential for any application development and release process. It should be taken seriously as it can be the difference between a successful and an unsuccessful product.
In the next chapter, we will focus on a different yet crucial topic: SEO and performance. Even if our code base is 100% tested, well-designed, and working great, we need to consider its SEO score and performance. In many cases, we want as many people as possible to be browsing our applications, and we must take care of search engine optimization to reach a large audience to validate our product.