Testing React Applications with Jest and React Testing Library

Course details

This course is designed for advanced React developers who want to master testing practices using React Testing Library. Join instructor Oluchukwu Okpala as she demonstrates how to write effective unit and integration tests, simulate user interactions, mock APIs, and successfully apply test-driven development (TDD) principles. By the end of this course, you’ll be prepared to ensure your React applications are robust, scalable, and maintainable through comprehensive testing techniques and best practices.

Learning objectives
Write comprehensive unit and integration tests for React applications using Jest and React Testing Library.
Simulate user interactions and test asynchronous behavior to ensure the app functions as expected.
Mock external APIs and manage dependencies to isolate components for testing.
Implement best practices for writing clean, maintainable, and scalable tests in React projects.
Apply test-driven development (TDD) principles to build robust, bug-free features from scratch.

Concepts

0. Introduction

01 - Testing React applications
02 - What to expect from this course

1. Introduction to the Course

03 - Why React Testing Library
04 - What you should know
05 - Overview of the blog app

2. Introduction to Testing React Applications

06 - Introduction to Vitest and React Testing Library
07 - How to configure Vitest and RTL
08 - Writing simple unit tests
09 - Setting up Vitest for code coverage reports
10 - Challenge - Simple unit and integration tests
11 - Solution - Simple unit and integration tests

3. Writing Tests for the Blog App

12 - Writing tests for forms and input validation
13 - Unit tests for individual components PostCard
14 - Mocking API dependencies - Fetching blog posts
15 - Testing user interactions and error handling
16 - Testing async behavior - Updating comments
17 - Ensuring correct integration with state management
18 - Challenge - Unit and integration tests - CreatePost
19 - Solution - Unit and integration tests - CreatePost

4. Advanced Testing Concepts

20 - Catching unexpected UI changes with snapshot tests
21 - Writing scalable tests and ensuring complete coverage
22 - Challenge - Snapshot and unit tests - Login component
23 - Solution - Snapshot and unit tests - Login component

5. Test-Driven Development (TDD) in Action

24 - Introduction to TDD
25 - Writing failing tests first - The red-green-refactor cycle
26 - Refactoring - Completing the TDD cycle
27 - Unit tests vs. integration tests
28 - Challenge - Apply TDD to favorites feature

Conclusion

29 - Course overview
30 - Next steps