Jest

Jest is the most popular JavaScript testing framework. Created by Meta, it provides a zero-config setup, built-in mocking, snapshot testing, and code coverage for projects of any size.

2 Lessons

Knowledge Course

Fundamentals of Jest

Core concepts and key principles of Jest

45 min→

Practical Jest Guide

Real-world usage, best practices, and common patterns

60 min→

Curated Resources

Free Books

Jest Documentation

Comprehensive official documentation covering setup, configuration, and API.

Jest Getting Started

Quickstart guide for installing and writing your first Jest test.

Official Documentation

Jest API Reference

Complete API reference for describe, it, expect, and lifecycle methods.

Jest Mock Functions

Guide to using mock functions, spies, and manual mocks in Jest.

Interactive Courses

Jest Tutorial (JavaScript.Info)

Free tutorial covering Jest basics, testing patterns, and async testing.

Video Courses

Jest Full Course (YouTube)

Multi-hour courses covering Jest fundamentals, mocking, and CI integration.

Practice & Challenges

Jest Playground

Online sandbox for experimenting with Jest test cases.

Reference & Cheatsheets

Jest Cheatsheet (devhints)

Quick reference for Jest matchers, mocking, and snapshot testing.

News & Updates

Jest Blog

Official Jest blog with release notes and feature announcements.

Community

Jest Discord

Official Jest community on Discord.

Reddit r/javascript

JavaScript community with Jest discussions.