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Star history, last 90 days
Date	Stars
2026-07-24	20845
2026-07-25	20845
2026-07-28	20845
2026-07-30	20845
2026-08-06	20845

Star history, last 90 days

Date

Stars

2026-07-24

20845

2026-07-25

20845

2026-07-28

20845

2026-07-30

20845

2026-08-06

20845

*[Please support our friend Vadim Demedes and the people in Ukraine.](https://stand-with-ukraine.pp.ua/)* --- # <img src="media/header.png" title="AVA" alt="AVA logo" width="530"> AVA is a test runner for Node.js with a concise API, detailed error output, embrace of new language features and thread isolation that lets you develop with confidence 🚀 Watch this repository and follow the [Discussions](https://github.com/avajs/ava/discussions) for updates. Read our [contributing guide](.github/CONTRIBUTING.md) if you're looking to contribute (issues / PRs / etc). ![](media/verbose-reporter.png) Translations: [Español](https://github.com/avajs/ava-docs/blob/main/es_ES/readme.md), [Français](https://github.com/avajs/ava-docs/blob/main/fr_FR/readme.md), [Italiano](https://github.com/avajs/ava-docs/blob/main/it_IT/readme.md), [日本語](https://github.com/avajs/ava-docs/blob/main/ja_JP/readme.md), [한국어](https://github.com/avajs/ava-docs/blob/main/ko_KR/readme.md), [Português](https://github.com/avajs/ava-docs/blob/main/pt_BR/readme.md), [Русский](https://github.com/avajs/ava-docs/blob/main/ru_RU/readme.md), [简体中文](https://github.com/avajs/ava-docs/blob/main/zh_CN/readme.md) ## Why AVA? - Minimal and fast - Simple test syntax - Runs tests concurrently - Enforces writing atomic tests - No implicit globals - Includes TypeScript definitions - [Magic assert](#magic-assert) - [Isolated environment for each test file](./docs/01-writing-tests.md#test-isolation) - [Promise support](./docs/01-writing-tests.md#promise-support) - [Async function support](./docs/01-writing-tests.md#async-function-support) - [Observable support](./docs/01-writing-tests.md#observable-support) - [Enhanced assertion messages](./docs/03-assertions.md#enhanced-assertion-messages) - [Automatic parallel test runs in CI](#parallel-runs-in-ci) - [TAP reporter](./docs/05-command-line.md#tap-reporter) ## Usage To install and set up AVA, run: ```console npm init ava ``` Your `package.json` will then look like this (exact version notwithstanding): ```json { "name": "awesome-package", "type": "module", "scripts": { "test": "ava" }, "devDependencies": { "ava": "^5.0.0" } } ``` Or if you prefer using Yarn: ```console yarn add ava --dev ``` Alternatively you can install `ava` manually: ```console npm install --save-dev ava ``` *Make sure to install AVA locally. AVA cannot be run globally.* Don't forget to configure the `test` script in your `package.json` as per above. ### Create your test file Create a file named `test.js` in the project root directory. _Note that AVA's documentation assumes you're using ES modules._ ```js import test from 'ava'; test('foo', t => { t.pass(); }); test('bar', async t => { const bar = Promise.resolve('bar'); t.is(await bar, 'bar'); }); ``` ### Running your tests ```console npm test ``` Or with `npx`: ```console npx ava ``` Run with the `--watch` flag to enable AVA's [watch mode](docs/recipes/watch-mode.md): ```console npx ava --watch ``` ## Supported Node.js versions AVA supports the latest release of any major version that [is supported by Node.js itself](https://github.com/nodejs/Release#release-schedule). Read more in our [support statement](docs/support-statement.md). ## Highlights ### Magic assert AVA adds code excerpts and clean diffs for actual and expected values. If values in the assertion are objects or arrays, only a diff is displayed, to remove the noise and focus on the problem. The diff is syntax-highlighted too! If you are comparing strings, both single and multi line, AVA displays a different kind of output, highlighting the added or missing characters. ![](media/magic-assert-combined.png) ### Clean stack traces AVA automatically removes unrelated lines in stack traces, allowing you to find the source of an error much faster, as seen above. ### Parallel runs in CI AVA automatically detects whether your CI environment supports parallel builds. Each build will run a subset of all test