Free online courseReact.js Unit Testing and Integration Testing Tutorial

Course Description

Learn how to test React applications with a practical, beginner-friendly approach focused on real-world workflows. This free online course guides you through the essentials of unit testing and integration testing in modern React projects, helping you build confidence in your code and ship changes with fewer regressions.

You will set up a complete testing environment using popular tools from the React ecosystem, including Jest and React Testing Library, and learn how to keep quality checks consistent with linting and automated CI pipelines. Step by step, you will practice writing reliable tests that verify UI behavior, component interactions, and user flows instead of fragile implementation details.

The course also covers testing async behavior, working with mocks, and isolating dependencies in a maintainable way. You will learn strategies for mocking components and functions, as well as simulating HTTP requests using approaches suitable for Fetch or Axios, including service-worker based mocking for more realistic network scenarios.

Beyond the basics, you will explore testing patterns for apps that use hooks and data fetching, validate forms with user-centric assertions, and handle framework-specific needs such as router behavior in Next.js. By the end, you will have a strong foundation for creating a dependable test suite that supports refactoring, speeds up debugging, and improves overall code quality in React projects.