jest

When to use this skill

Use this skill whenever the user wants to:

• Write unit tests and integration tests with Jest
• Set up Jest in a project
• Use Jest matchers and assertions
• Test asynchronous code
• Mock functions, modules, and dependencies
• Create snapshot tests
• Configure Jest for different environments
• Use Jest with TypeScript, React, Vue, or other frameworks
• Run tests and generate coverage reports
• Use Jest CLI commands
• Set up test environments (jsdom, node)
• Use Jest with Vite (via vite-jest, though Vitest is recommended for new Vite projects)

How to use this skill

This skill is organized to match the Jest official documentation structure (https://jestjs.io/docs/getting-started, https://jestjs.io/docs/api). When working with Jest: