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 >=v18.00

import { assert, describe, expect, it } from 'vitest'

describe('suite name', () => {
  it('foo', () => {
    expect(1 + 1).toEqual(2)
    expect(true).to.be.