In this article, I’m going to introduce you to a React testing tool named Jest, along with the popular library Enzyme, which is designed to test React components. I’ll introduce you to Jest testing techniques, including: running tests, testing React components, snapshot testing, and mocking. If you are new to testing and wondering how to get started, you will find this tutorial helpful because we will start with an introduction to testing.

https://www.smashingmagazine.com/2020/06/practical-guide-testing-react-applications-jest/