How to write effective tests for React apps with React testing library?

How to write effective tests for React apps with React testing library?

Testing might seem like extra work at first. Why write tests when you could be delivering features for your application? Writing tests may seem like unproductive work that doesn’t add any immediate value to your project. How to write effective tests for React apps with React testing library?

*This tutorial demonstrates how to write effective tests for your React application with react testing library and jest. *

We will cover

  • How to write effective tests for your react components
  • Mocking API calls
  • How to test Redux connected component
  • Testing custom hooks

Why write tests?

The main reason we write tests is to prevent bugs, keep code clean and maintainable. Testing might seem like extra work at first. Why write tests when you could be delivering features for your application? Writing tests may seem like unproductive work that doesn’t add any immediate value to your project. However, writing** effective tests** ensures the delivery of well maintained, bug-free code. If you don’t write tests there’s a good chance that you will deliver bugs and as the product grows you will spend more and more time fixing these bugs. Therefore, choosing to write automated tests is a worthwhile investment.

Don’t get too excited though. Tests are really a double-edged sword. You can very well end up wasting a lot of time (and money of course) writing tests that have absolutely no value. An effective well-written test ensures application quality and maintainability. Whereas a bad tests is just a waste of time and resource that doesn’t provide any value. An effective test ensures how the application (or a component of the application) should behave form a user’s perspective. It doesn’t test the implementation details from a programmer’s perspective. If you are writing tests to verify implantation details you are wasting valuable time and the test coverage you have is nothing but a false sense of security.

javascript react

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