name: vitest
description: A blazing fast unit testing framework powered by Vite
license: MIT

Vitest

Vite-native testing framework with Jest-compatible API.

When to Use

• Writing unit/integration tests for Vite projects
• Testing Vue/React/Svelte components
• Mocking modules, timers, or dates
• Running concurrent/parallel tests
• Type testing with TypeScript

Quick Start

npm i -D vitest

// vitest.config.ts
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    globals: true,
    environment: 'node',  // or 'jsdom' for DOM tests
  },
})

// example.test.ts
import { describe, expect, it, vi } from 'vitest'

describe('math', () => {
  it('adds numbers', () => {
    expect(1 + 1).toBe(2)
  })
})

Reference Files

Load Based on Task

Setting up tests? → Load config.md
Writing test cases? → Load test-api.md
Mocking dependencies? → Load mocking.md
Assertions/snapshots? → Load utilities.md
DOM/browser/types? → Load advanced.md

Cross-Skill References

• Vue component testing → Use vue skill for component patterns
• Library testing → Use ts-library skill for library patterns
• Vite configuration → Use vite skill for shared config