Unit testing is a way to test small, isolated code. React Native itself is expressed as follows. Unit tests target the smallest part of your code, such as individual functions or classes. Therefore, unit tests include testing functions, classes, and components (all small parts of your project).
If the React Native unit tests that you run are well written and run them every time there's a change in the code, you'll have more confidence in your project performance. It will also be easier for you to maintain the code accurately. Your unit tests need to be modular so that you can reuse them. The easier your code is to reuse, the more tests you can do, and the more time you save.
Mocha: Great flexibility comes with a great configuration Mocha is a much older and wiser framework than most testing frameworks like Jest. The large community makes getting support and documentation to resolve issues more accessible, and Mocha gives you more flexibility and configuration. Mocha offers many options, including claims, spy libraries, and provocation. Use chai for assertions. Use both Test-Driven Development (TDD) and Behavior Driven Development (BDD). You can also run your tests in an integrated development environment like Webstorm. Mocha's flexibility makes it suitable for large projects. However, its configuration can be more complex than Jest's configuration.