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:

1. **Identify the topic** from the user's request:
   - Getting started/快速开始 → `examples/getting-started/installation.md` or `examples/getting-started/using-matchers.md`
   - Testing/测试 → `examples/testing/asynchronous.md` or `examples/testing/setup-teardown.md`
   - Mock functions/Mock 函数 → `examples/testing/mock-functions.md`
   - Mock modules/Mock 模块 → `examples/testing/manual-mocks.md`
   - Snapshots/快照 → `examples/testing/snapshot-testing.md`
   - Configuration/配置 → `examples/configuration/jest-config.md`
   - CLI/命令行 → `examples/configuration/cli-options.md`

2. **Load the appropriate example file** from the `examples/` directory:

   **Getting Started (快速开始) - `examples/getting-started/`**:
   - `examples/getting-started/installation.md` - Installing Jest and basic setup
   - `examples/getting-started/using-matchers.md` - Using Jest matchers and assertions

   **Testing (测试) - `examples/testing/`**:
   - `examples/testing/asynchronous.md` - Testing asynchronous code
   - `examples/testing/setup-teardown.md` - Setup and teardown functions
   - `examples/testing/mock-functions.md` - Mocking functions
   - `examples/testing/manual-mocks.md` - Manual mocks
   - `examples/testing/snapshot-testing.md` - Sna