Expect.underscore.js NPM

Expect.underscore

Expectjs with underscore support.

expect([1,2,3,4]).to._.find(function(n) { 
    return n % 2 == 0;
});

expectjs is a 'Minimalistic BDD assertion toolkit', which is very simple to use, but is short in matchers that makes writing tests less jolly.

This extension inserts underscore functions as matchers under the belt, so you can easily test with power of underscore in your hands.

How to use

Node

$ npm install expect.underscore.js

Example

var expect  = require('expect.js'),
    _       = require('underscore');

// PATCH expect here
expect = require('expect.underscore.js').extend(expect, _);

describe('check users for fred', function() {
    var userNames = [
        'barney',  
        'fred',
        'pebbles',
    ];
    var users = [
      { 'user': 'barney',  'active': true },
      { 'user': 'fred',    'active': false },
      { 'user': 'pebbles', 'active': false }
    ];

    it('using expectjs', function() {
        // you either check with the whole object,
        expect(userNames).to.contain('fred');

        // or split the lines
        var fred = _.find(users, {user: 'fred'});
        expect(fred).to.be.ok();
    });

    it('using _.find', function() {
        // better readability
        expect(users).to._.find({user: 'fred'});
    });


    describe('.not.to', function() {
        it('using _.find', function() {
            expect(users).not.to._.find({
                active: undefined
            });
        });
    });
});

You can use every underscore methods under the .to._ object, and it will check if the result is .ok().