Show object diffs in Mocha

[rstacruz]

Here's a comparison of how Chai and Expect handles object diffs. Notice how it's very readable with the diff being shown.

made using this code:

describe('object comparison', function () {
  it('via chai', function () {
    var expect = require('chai').expect
    expect({a:1,b:2,c:3}).to.eq({a:1,b:2,c:4})
  })

  it('via expect', function () {
    var expect = require('../index')
    expect({a:1,b:2,c:3}).toEqual({a:1,b:2,c:4})
  })
})

[rstacruz]

Chai throws an assertion error in this format:

{ [AssertionError: expected { a: 1, b: 2, c: 3 } to equal { a: 1, b: 2, c: 4 }]
  message: 'expected { a: 1, b: 2, c: 3 } to equal { a: 1, b: 2, c: 4 }',
  showDiff: true,
  actual: { a: 1, b: 2, c: 3 },
  expected: { a: 1, b: 2, c: 4 } }

[mjackson]

Fixed in #30

[Anahkiasen]

Anything similar possible for Karma?

[mjackson]

Karma just runs browsers and reports the results to the console. Use mocha with karma to get these doffs in the console.

[thenickcox]

For anyone finding this via Google, karma-mocha-reporter provides this functionality, and is pretty much drop-in.