React js - Test-Cases

Types of React js Test Cases

October 17, 2020

Testing is a crucial part of the software development process, and React applications are no exception. In this comprehensive guide, we will discuss various testing frameworks like Jest and Enzyme and explore how to effectively write tests for React applications.

1. Introduction to Testing in React

Testing in React involves validating the functionality and behavior of components and ensuring that the application works as intended. There are different types of tests you can write, including unit tests, integration tests, and snapshot tests.

  • Unit Tests: Test individual units of code in isolation, such as functions, components, or modules.

  • Integration Tests: Test how different components or modules interact with each other.

  • Snapshot Tests: Capture and compare the rendered output of a component or module to detect unintended changes.

    • E2E Tests: Focus is on testing the entire application flow and ensuring it works as designed from start to finish, Involves in a real UI, a real backend database, real services etc, Take the longest as they cover the most amount of code, Have a cost implication as you interact with real APIs that may charge based on the number of requests.

      • Testing Pyramid: It includes, E2E Tests, Integration tests, Unit Tests.

        • RTL Philosophy: The more your tests resemble the way your software is used, the more confidence they can give you.

          Test we are going to learn to write in this series strike a balance between unit tests in the sense they are at a component level and easy to write and maintain and E2E tests in the sense they resemble the way a user would interact with  a component
          With React Testing Library, we are not concerned about the implementation details of a  component.