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<h1 align="center">
Vitest
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Next generation testing framework powered by Vite.
<p>
<p align="center">
<a href="https://npmx.dev/package/vitest"><img src="https://img.shields.io/npm/v/vitest?color=729B1B&label=" alt="current vitest version badge"></a>
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<a href="https://chat.vitest.dev"><b>Get involved!</b></a>
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<a href="https://vitest.dev">Documentation</a> | <a href="https://vitest.dev/guide/">Getting Started</a> | <a href="https://vitest.dev/guide/#examples">Examples</a> | <a href="https://vitest.dev/guide/why">Why Vitest?</a>
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<a href="https://cn.vitest.dev">中文文档</a>
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</h4>
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## Features
- [Vite](https://vitejs.dev/)'s config, transformers, resolvers, and plugins. Use the same setup from your app!
- [Jest Snapshot](https://jestjs.io/docs/snapshot-testing)
- [Chai](https://www.chaijs.com/) built-in for assertions, with [Jest expect](https://jestjs.io/docs/expect) compatible APIs
- [Smart & instant watch mode](https://vitest.dev/guide/features.html#watch-mode), like HMR for tests!
- [Native code coverage](https://vitest.dev/guide/features.html#coverage) via [`v8`](https://v8.dev/blog/javascript-code-coverage) or [`istanbul`](https://istanbul.js.org/).
- [Tinyspy](https://github.com/tinylibs/tinyspy) built-in for mocking, stubbing, and spies.
- [JSDOM](https://github.com/jsdom/jsdom) and [happy-dom](https://github.com/capricorn86/happy-dom) for DOM and browser API mocking
- [Browser Mode](https://vitest.dev/guide/browser/) for running component tests in the browser
- Components testing ([Vue](https://github.com/vitest-tests/browser-examples/tree/main/examples/vue), [React](https://github.com/vitest-tests/browser-examples/tree/main/examples/react), [Svelte](https://github.com/vitest-tests/browser-examples/tree/main/examples/svelte), [Lit](./examples/lit), [Marko](https://github.com/marko-js/examples/tree/master/examples/library-ts))
- Benchmarking support with [Tinybench](https://github.com/tinylibs/tinybench)
- [Projects](https://vitest.dev/guide/projects) support
- [expect-type](https://github.com/mmkal/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
```ts
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()
})
})
```
```bash
$ npx vitest
```
## Sponsors
<p align="center">
<a href="https://cdn.jsdelivr.net/gh/sheremet-va/static/vitest/sponsors.svg">
<img src='https://cdn.jsdelivr.net/gh/sheremet-va/static/vitest/sponsors.svg' alt="vitest's sponsors"/>
</a>
</p>
### Vladimir Sponsors
<p align="center">
<a href="https://cdn.jsdelivr.net/gh/sheremet-va/static/sponsors.svg">
<img src='https://cdn.jsdelivr.net/gh/sheremet-va/static/sponsors.svg' alt="vladimir's sponsors"/>
</a>
</p>
### Anthony Fu Sponsors
<p align="center">
<a href="https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg">
<img src='https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg' alt="anthony's sponsors"/>
</a>
</p>
### Patak Sponsors
<p align="center">
<a href="https://cdn.jsdelivr.net/gh/patak-dev/static/sponsors.svg">
<img src='https://cdn.jsdelivr.net/gh/patak-dev/static/sponsors.svg' alt="patak's sponsors"/>
</a>
</p>
## Credits
Thanks to:
- [The Jest team and community](https://jestjs.io/) for creating a delightful testing API
- [@lukeed](https://github.com/lukeed) for the work on [uvu](https://github.com/lukeed/uvu) where we are inspired a lot from.
- [@pi0](https://github.com/pi0) for the idea and implementation of using Vite to transform and bundle the server code.
- [The Vite team](https://github.com/vitejs/vite) for brainstorming the initial idea.
- [@patak-dev](https://github.com/patak-dev) for the awesome package name!
## Contribution
See [Contributing Guide](https://github.com/vitest-dev/vitest/blob/main/CONTRIBUTING.md).
## License
[MIT](./LICENSE) License © 2021-Present VoidZero Inc. and Vitest contributors
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