Next generation testing framework powered by Vite.

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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
• Browser Mode for running component tests in the browser
• Components testing (Vue, React, Svelte, Lit, Marko)
• Benchmarking support with Tinybench
• Projects 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
• Sharding support
• Reporting Uncaught Errors
• Run your tests in the browser natively

Vitest requires Vite >=v6.0.0 and Node >=v20.0.0

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 VoidZero Inc. and Vitest contributors