Next generation testing framework powered by Vite.

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Documentation | Getting Started | Examples | Why Vitest?

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• Vite's config, transformers, resolvers, and plugins. Use the same setup from your app!
• Jest Snapshot
• Chai built-in for assertions, with Jest expect compatible APIs.
• Smart & instant watch mode, like HMR for tests!
• Native code coverage via v8 or istanbul.
• Tinyspy built-in for mocking, stubbing, and spies.
• JSDOM and happy-dom for DOM and browser API mocking
• Components testing (Vue, React, Svelte, Lit, Vitesse, Marko)
• Workers multi-threading via Tinypool (a lightweight fork of Piscina)
• Benchmarking support with Tinybench
• Workspace support
• expect-type for type-level testing
• ESM first, top level await
• Out-of-box TypeScript / JSX support
• Filtering, timeouts, concurrent for suite and tests

Vitest 1.0 requires Vite >=v5.0.0 and Node >=v18.0.0

import { assert, describe, expect, it } from 'vitest' describe('suite name', () => { it('foo', () => { expect(1 + 1).toEqual(2) expect(true).to.be.true }) it('bar', () => { assert.equal(Math.sqrt(4), 2) }) it('snapshot', () => { expect({ foo: 'bar' }).toMatchSnapshot() }) })

$ npx vitest

Thanks to:

• The Jest team and community for creating a delightful testing API
• @lukeed for the work on uvu where we are inspired a lot from.
• @pi0 for the idea and implementation of using Vite to transform and bundle the server code.
• The Vite team for brainstorming the initial idea.
• @patak-dev for the awesome package name!

See Contributing Guide.

MIT License © 2021-Present Anthony Fu, Matias Capeletto