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avajs/ava: Node.js test runner that lets you develop with confidence 🚀

Please support our friend Vadim Demedes and the people in Ukraine.

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 for updates.

Read our contributing guide if you're looking to contribute (issues / PRs / etc).

Translations: Español, Français, Italiano, 日本語, 한국어, Português, Русский, 简体中文

Minimal and fast
Simple test syntax
Runs tests concurrently
Enforces writing atomic tests
No implicit globals
Includes TypeScript definitions
Magic assert
Isolated environment for each test file
Promise support
Async function support
Observable support
Enhanced assertion messages
Automatic parallel test runs in CI
TAP reporter

To install and set up AVA, run:

Your package.json will then look like this (exact version notwithstanding):

{
	"name": "awesome-package",
	"type": "module",
	"scripts": {
		"test": "ava"
	},
	"devDependencies": {
		"ava": "^5.0.0"
	}
}

Or if you prefer using Yarn:

Alternatively you can install ava manually:

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 a file named test.js in the project root directory.

Note that AVA's documentation assumes you're using ES modules.

import test from 'ava';

test('foo', t => {
	t.pass();
});

test('bar', async t => {
	const bar = Promise.resolve('bar');
	t.is(await bar, 'bar');
});

Or with npx:

Run with the --watch flag to enable AVA's watch mode:

Supported Node.js versions

AVA supports the latest release of any major version that is supported by Node.js itself. Read more in our support statement.

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.

AVA automatically removes unrelated lines in stack traces, allowing you to find the source of an error much faster, as seen above.

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 package for a list of supported CI environments.

Please see the files in the docs directory:

We have a growing list of common pitfalls you may experience while using AVA. If you encounter any issues you think are common, comment in this issue.

How is the name written and pronounced?

AVA, not Ava or ava. Pronounced /ˈeɪvə/: Ay (face, made) V (vie, have) A (comma, ago)

What is the header background?

It's the Andromeda galaxy.

What is the difference between concurrency and parallelism?

Concurrency is not parallelism. It enables parallelism.

GitHub Discussions

eslint-plugin-ava — Lint rules for AVA tests
@ava/typescript — Test TypeScript projects
@ava/cooperate — Low-level primitives to enable cooperation between test files
@ava/get-port — Reserve a port while testing

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