*[Please support our friend Vadim Demedes and the people in Ukraine.](https://stand-with-ukraine.pp.ua/)* --- # AVA logo

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 files, while still making sure all tests get executed. See the [`ci-parallel-vars`](https://www.npmjs.com/package/ci-parallel-vars) package for a list of supported CI environments. ## Documentation Please see the [files in the `docs` directory](./docs): * [Writing tests](./docs/01-writing-tests.md) * [Execution context](./docs/02-execution-context.md) * [Assertions](./docs/03-assertions.md) * [Snapshot testing](./docs/04-snapshot-testing.md) * [Command line (CLI)](./docs/05-command-line.md) * [Configuration](./docs/06-configuration.md) * [Test timeouts](./docs/07-test-timeouts.md) ### Common pitfalls We have a growing list of [common pitfalls](docs/08-common-pitfalls.md) you may experience while using AVA. If you encounter any issues you think are common, comment in [this issue](https://github.com/avajs/ava/issues/404). ### Recipes - [Test setup](docs/recipes/test-setup.md) - [TypeScript](docs/recipes/typescript.md) - [Shared workers](docs/recipes/shared-workers.md) - [Watch mode](docs/recipes/watch-mode.md) - [When to use `t.plan()`](docs/recipes/when-to-use-plan.md) - [Passing arguments to your test files](docs/recipes/passing-arguments-to-your-test-files.md) - [Splitting tests in CI](docs/recipes/splitting-tests-ci.md) - [Code coverage](docs/recipes/code-coverage.md) - [Endpoint testing](docs/recipes/endpoint-testing.md) - [Browser testing](docs/recipes/browser-testing.md) - [Testing Vue.js components](docs/recipes/vue.md) - [Debugging tests with Chrome DevTools](docs/recipes/debugging-with-chrome-devtools.md) - [Debugging tests with VSCode](docs/recipes/debugging-with-vscode.md) - [Debugging tests with WebStorm](docs/recipes/debugging-with-webstorm.md) - [Isolated MongoDB integration tests](docs/recipes/isolated-mongodb-integration-tests.md) - [Testing web apps using Puppeteer](docs/recipes/puppeteer.md) - [Testing web apps using Selenium WebDriverJS](docs/recipes/testing-with-selenium-webdriverjs.md) ## FAQ ### How is the name written and pronounced? AVA, not Ava or ava. Pronounced [`/ˈeɪvə/`](media/pronunciation.m4a?raw=true): Ay (f**a**ce, m**a**de) V (**v**ie, ha**v**e) A (comm**a**, **a**go) ### What is the header background? It's the [Andromeda galaxy](https://simple.wikipedia.org/wiki/Andromeda_galaxy). ### What is the difference between concurrency and parallelism? [Concurrency is not parallelism. It enables parallelism.](https://stackoverflow.com/q/1050222) ## Support - [GitHub Discussions](https://github.com/avajs/ava/discussions) ## Related - [eslint-plugin-ava](https://github.com/avajs/eslint-plugin-ava) — Lint rules for AVA tests - [@ava/typescript](https://github.com/avajs/typescript) — Test TypeScript projects - [@ava/cooperate](https://github.com/avajs/cooperate) — Low-level primitives to enable cooperation between test files - [@ava/get-port](https://github.com/avajs/get-port) — Reserve a port while testing ## Links - [AVA stickers, t-shirts, etc](https://www.redbubble.com/people/sindresorhus/works/30330590-ava-logo) - [Awesome list](https://github.com/avajs/awesome-ava) - [Do you like AVA? Donate here!](https://opencollective.com/ava) - [More…](https://github.com/avajs/awesome-ava) ## Team [![Mark Wubben](https://github.com/novemberborn.png?size=100)](https://github.com/novemberborn) | [![Sindre Sorhus](https://github.com/sindresorhus.png?size=100)](https://github.com/sindresorhus) ---|--- [Mark Wubben](https://novemberborn.net) | [Sindre Sorhus](https://sindresorhus.com) ###### Former - [Kevin Mårtensson](https://github.com/kevva) - [James Talmage](https://github.com/jamestalmage) - [Juan Soto](https://github.com/sotojuan) - [Jeroen Engels](https://github.com/jfmengels) - [Vadim Demedes](https://github.com/vadimdemedes)

	Stars	Issues	Version	Updated	Created
ava			6.1.2	2 months ago	10 years ago
cypress	46,162	1,466	13.8.1	8 days ago	10 years ago
jest	43,612	360	29.7.0	8 months ago	12 years ago
karma			6.4.3	2 months ago	11 years ago
nightwatch			3.6.1	10 days ago	10 years ago
puppeteer			22.7.1	7 days ago	11 years ago

ava vs cypress vs jest vs karma vs nightwatch vs puppeteer

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