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    Build Status NPM version Dependencies Status stable

    browser support

    Beautiful assertion library.


    • Straight-forward: Alright should get out of your way and just let you define your tests with what you already know: plain JavaScript.

    • No verbosity: We don't want expect(x)

    • Helpful error messages: When things go wrong, Alright should do its best to show you exactly what's wrong and how you might fix it.

    • Test-framework agnostic: Alright should work with anything that expect Errors to be thrown when assertions fail.

    • Extensible: It should be easy to extend the built-in assertions with plain JavaScript.

    • Work with older Browsers: Some people still need to support old IEs, Alright should work on them.


    Using the Sweet.js macros:

    // for macros to work, you need to use 'alright' as your identifier 
    var alright = require('alright')
    // simple assertions 
    add(a)(b) => a + b
    add(a)(b) => not a + b
    // anything goes assertions 
    add(a)(b) should equal(+ b)
    add(a)(b) should not equal(+ b)
    // asynchronous assertions with pure fantasy-land monads, or Promises/A+ 
    asyncAdd(a)(b) will equal(+ b)
    asyncAdd(a)(b) will not equal(+ b)

    Using vanilla JavaScript:

    var _ = require('alright')
    // Use verify for synchronous assertions 
    _.verify(add(a)(b))(_.equals(+ b))
    _.verify(add(a)(b))(_.not(_.equals(+ b)))
    // use verifyFuture for monadic Futures, and verifyPromise for Promises/A+ 
    _.verifyMonad(asyncAdd(a)(b))(_.equals(+ b))


    The easiest way is to grab it from NPM. If you're running in a Browser environment, you can use Browserify

    $ npm install alright

    Using with CommonJS

    If you're not using NPM, Download the latest release, and require the alright.umd.js file:

    var Alright = require('alright')

    Using with AMD

    Download the latest release, and require the alright.umd.js file:

    require(['alright'], function(Alright) {
      ( ... )

    Using without modules

    Download the latest release, and load the alright.umd.js file. The properties are exposed in the global Alright object:

    <script src="/path/to/alright.umd.js"></script>

    Compiling from source

    If you want to compile this library from the source, you'll need Git, Make, Node.js, and run the following commands:

    $ git clone git://
    $ cd alright
    $ npm install
    $ make bundle

    This will generate the dist/alright.umd.js file, which you can load in any JavaScript environment.


    You can read the documentation online or build it yourself:

    $ git clone git://
    $ cd alright
    $ npm install
    $ make documentation

    Then open the file docs/index.html in your browser.

    Platform support

    This library assumes an ES5 environment, but can be easily supported in ES3 platforms by the use of shims. Just include es5-shim :)


    Copyright (c) 2014 Quildreen Motta.

    Released under the MIT licence.


    npm i alright

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