Notre avis
Vitest est un framework de test unitaire propulsé par Vite, compatible avec l'API Jest, offrant une exécution rapide, des mocks, des snapshots, la couverture de code et des fonctionnalités avancées comme les tests de types.
Points forts
- Intégration transparente avec Vite, réutilisant sa configuration et ses plugins
- API compatible Jest facilitant la migration
- Mocking, couverture (V8 ou Istanbul) et tests de snapshots intégrés
- Mode watch intelligent et exécution parallèle via des workers multithreads
Limites
- Nécessite une connaissance de l'écosystème Vite pour la configuration avancée
- La compatibilité Jest n'est pas totale pour certains plugins ou transforms
- Certaines fonctionnalités avancées (comme le test de types) peuvent nécessiter des réglages supplémentaires
Quand vous avez besoin d'un environnement de test unitaire moderne et rapide pour un projet Vite, TypeScript ou React, avec support du mocking et de la couverture.
Quand vous dépendez d'un écosystème de plugins Jest tiers ou que vous testez des environnements non-Vite avec des dépendances héritées lourdes.
Analyse de sécurité
SûrThe skill is purely informational documentation about the Vitest testing framework. It declares no allowed tools and contains no executable or destructive instructions. No risk of exfiltration, unsafe commands, or obfuscation.
Aucun point d'attention détecté
Exemples
Write a Vitest unit test for the `add` function in `src/utils.ts`, including edge cases and mocking a dependency.Run Vitest with coverage enabled for only test files matching 'user' and output an HTML report.Create a `vitest.config.ts` to test Vue components with jsdom and use `vi.mock` to stub an API module.name: vitest description: Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test filtering and fixtures. metadata: author: Anthony Fu version: "2026.1.28" source: Generated from https://github.com/vitest-dev/vitest, scripts located at https://github.com/antfu/skills
Vitest is a next-generation testing framework powered by Vite. It provides a Jest-compatible API with native ESM, TypeScript, and JSX support out of the box. Vitest shares the same config, transformers, resolvers, and plugins with your Vite app.
Key Features:
- Vite-native: Uses Vite's transformation pipeline for fast HMR-like test updates
- Jest-compatible: Drop-in replacement for most Jest test suites
- Smart watch mode: Only reruns affected tests based on module graph
- Native ESM, TypeScript, JSX support without configuration
- Multi-threaded workers for parallel test execution
- Built-in coverage via V8 or Istanbul
- Snapshot testing, mocking, and spy utilities
The skill is based on Vitest 3.x, generated at 2026-01-28.
Core
| Topic | Description | Reference | | ------------- | --------------------------------------------------------------- | -------------------------------------------- | | Configuration | Vitest and Vite config integration, defineConfig usage | core-config | | CLI | Command line interface, commands and options | core-cli | | Test API | test/it function, modifiers like skip, only, concurrent | core-test-api | | Describe API | describe/suite for grouping tests and nested suites | core-describe | | Expect API | Assertions with toBe, toEqual, matchers and asymmetric matchers | core-expect | | Hooks | beforeEach, afterEach, beforeAll, afterAll, aroundEach | core-hooks |
Features
| Topic | Description | Reference | | ------------ | -------------------------------------------------------------- | ---------------------------------------------------------- | | Mocking | Mock functions, modules, timers, dates with vi utilities | features-mocking | | Snapshots | Snapshot testing with toMatchSnapshot and inline snapshots | features-snapshots | | Coverage | Code coverage with V8 or Istanbul providers | features-coverage | | Test Context | Test fixtures, context.expect, test.extend for custom fixtures | features-context | | Concurrency | Concurrent tests, parallel execution, sharding | features-concurrency | | Filtering | Filter tests by name, file patterns, tags | features-filtering |
Advanced
| Topic | Description | Reference | | ------------ | ------------------------------------------------------- | ------------------------------------------------------------ | | Vi Utilities | vi helper: mock, spyOn, fake timers, hoisted, waitFor | advanced-vi | | Environments | Test environments: node, jsdom, happy-dom, custom | advanced-environments | | Type Testing | Type-level testing with expectTypeOf and assertType | advanced-type-testing | | Projects | Multi-project workspaces, different configs per project | advanced-projects |
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