specify-assertions

Beautiful assertion library.

Philosophy

• 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).to.eventually.be.boring...

• 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.

Example

Using the Sweet.js macros:

var _ = require('specify-assertions')
 
// simple assertions
add(a)(b) => a + b
add(a)(b) => not a + b
 
// anything goes assertions
add(a)(b) should _.equal(a + b)
add(a)(b) should not _.equal(a + b)
 
// asynchronous assertions with pure fantasy-land monads, or Promises/A+
asyncAdd(a)(b) will _.equal(a + b)
asyncAdd(a)(b) will not _.equal(a + b)

Using vanilla JavaScript:

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

Installing

$ npm install specify-assertions

Tests

$ npm install
$ make test

Documentation

$ npm install
$ make documentation

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][] :)

Licence

Copyright (c) 2013-2014 Origami Tower.

This module is part of the Specify framework, and released under the MIT licence.