object-loops/test/test-index.js

Functional methods like forEach, map, filter, and other Array methods for Objects in javascript

var Code = require('code')
var Lab = require('lab')
var lab = exports.lab = Lab.script()

var describe = lab.describe
var it = lab.it
var before = lab.before
var after = lab.after
var expect = Code.expect

var noop = require('101/noop')

var allMethodNames = require('./fixtures/all-method-names.js')

describe('index', function () {
  describe('all methods', function () {
    before(function (done) {
      require('../index')()
      done()
    })
    after(require('./fixtures/reset-object-prototype'))
    it('should have all methods', function (done) {
      allMethodNames.forEach(function (name) {
        expect(Object[name]).to.be.a.function()
      })
      done()
    })
    it('should iterate through all the key-value pairs in the object', function (done) {
      var obj = {
        foo: 1,
        bar: 2,
        baz: 3
      }
      var callback = noop
      var thisArg = {}
      var fn = obj.forEach.bind(undefined, callback, thisArg)
      // assertions
      expect(fn).to.throw(/this/)
      done()
    })
    it('should iterate through all the key-value pairs in the object', function (done) {
      var obj = {
        foo: 1,
        bar: 2,
        baz: 3
      }
      var callback = noop
      var thisArg = {}
      var forEach = obj.forEach
      var fn = forEach.bind(global, callback, thisArg)
      // assertions
      expect(fn).to.throw(/this/)
      done()
    })
  })
  describe('warnings', function () {
    var consoleLog = console.log
    before(function (done) {
      Object.prototype.forEach = noop // eslint-disable-line
      done()
    })
    after(require('./fixtures/reset-object-prototype'))
    after(function (done) {
      console.log = consoleLog // restore to original
      done()
    })
    it('should warn if the prototype was already has a method', function (done) {
      console.log = function (data) {
        if (~data.indexOf('warn:')) {
          done()
        }
      }
      require('../index')()
    })
  })
})