Use when writing unit/integration tests for Vite projects - configure vitest.config.ts, write test suites with describe/it, create mock implementations with vi.fn and vi.mock, set up code coverage thresholds, and run tests in parallel

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 Reference Files Task File Configuration, CLI, projects [config.md](references/config.md) test/describe, hooks, fixtures [test api.md](references/test api.md) vi.fn, vi.mock, timers, spies [mocking.md](references/mocking.md) expect, snapshots, coverage, filtering [utilities.md](references/utilities.md) Environments, type testing, browser mode [advanced.md](references/advanced.md) Loading Files Consider loading these reference files based on your task: [ ] [references/config.md](references/config.md) if setting up vitest.config.ts, CLI, or workspace projects [ ] [references/test api.md](references/test api.md) if writing test/describe blocks, using hooks, or test fixtures [ ] [references/mocking.md](references/mocking.md) if mocking modules, timers, dates, or using spies [ ] [references/utilities.md](references/utilities.md) if writing assertions, snapshots, or configuring coverage [ ] [references/advanced.md](references/advanced.md) if configuring test environments, type testing, or browser mode DO NOT load all files at once. Load only what's relevant to your current task. 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