uvu is an extremely fast and lightweight test runner for Node.js and the browser

Ultimate Velocity, Unleashed

Features

* Super lightweight
* Extremely performant
* Individually executable test files
* Supports async/await tests
* Supports native ES Modules
* Browser-Compatible
* Familiar API

Install

``
$ npm install --save-dev uvu
`

Usage

> Check out /examples for a list of working demos!

`js
// tests/demo.js
import { test } from 'uvu';
import * as assert from 'uvu/assert';

test('Math.sqrt()', () => {
assert.is(Math.sqrt(4), 2);
assert.is(Math.sqrt(144), 12);
assert.is(Math.sqrt(2), Math.SQRT2);
});

test('JSON', () => {
const input = {
foo: 'hello',
bar: 'world'
};

const output = JSON.stringify(input);

assert.snapshot(output, {"foo":"hello","bar":"world"});
assert.equal(JSON.parse(output), input, 'matches original');
});

test.run();
`

Then execute this test file:

`sh


via uvu cli, for all /tests/** files

via node directly, for file isolation

> Note: The -r esm is for legacy Node.js versions. Learn More

> View the uvu CLI documentation

Assertions

The uvu/assert module is _completely_ optional.

In fact, you may use any assertion library, including Node's native assert module! This works because uvu relies on thrown Errors to detect failures. Implicitly, this also means that any uncaught exceptions and/or unhandled Promise rejections will result in a failure, which is what you want!

API

$3

> View uvu API documentation

The main entry from which you will import the test or suite methods.

$3

> View uvu/assert API documentation

A collection of assertion methods to use within your tests. Please note that:

* these are browser compatible
* these are _completely_ optional

Benchmarks

> via the /bench directory with Node v10.21.0

Below you'll find each test runner with two timing values:

* the took ___ value is the total process execution time – from startup to termination
* the parenthesis value ((___)) is the self-reported execution time, if known

Each test runner's stdout is printed to the console to verify all assertions pass.
Said output is excluded below for brevity.

`
~> "ava" took 594ms ( ??? )
~> "jest" took 962ms (356 ms)
~> "mocha" took 209ms ( 4 ms)
~> "tape" took 122ms ( ??? )
~> "uvu" took 72ms ( 1.3ms)
``

License

MIT © Luke Edwards