Jest Skill

Jest — A delightful JavaScript testing framework with a focus on simplicity. Version: Jest 30.x | Docs: jestjs.io

Quick Reference

Topic	File	Sections
Getting Started & Core Concepts	`getting-started.md`	Installation, first test, CLI usage, configuration (Babel, TypeScript, bundlers, ESLint), matchers, async testing, setup/teardown, mock functions
API Reference	`api.md`	Globals (test, describe, before/after hooks, .each, .concurrent, .failing, .todo), expect matchers, jest object (mock modules, mock functions, fake timers, misc), mock function API, CLI options, configuration options
Guides & Advanced	`guides.md`	Snapshot testing, timer mocks, manual mocks, ECMAScript modules, webpack integration, watch plugins, migration guide, testing frameworks (React/Vue/Angular/Express/Next.js), Puppeteer, MongoDB, DynamoDB, architecture