EmberJS Testing Cheat Sheet

Skipping Tests

// ...
import { skip } from 'qunit';

// ...

// simply change `test` to `skip` after importing `skip` from qunit
skip('when some test needs to be skipped', function(assert) {

})

Trimming Carriage Returns And Whitespace In Assertions

// ...
assert.equal(this.$('.some-element').text().trim(), 'Some Expected Value');
// ...

…will does not trim out whitespace from carriage returns which is really easy to produce if you format your handlebars pleasantly.

The fix: use JQuery’s $.trim(...) function. The above changes to:

// for completeness, import Ember in your test
// ...
import Ember from 'ember';
// ...
assert.equal(Ember.$.trim(this.$('.some-element').text()), 'Some Expected Value');
// ...

Freezing Dates & Time

# install the ember-sinon module
ember install ember-sinon

// import the sinon module
import sinon from 'sinon';

// create a test class variable that will hold your frozen clock
let CLOCK = null;

module('...', {
  // after each test restore to the system clock
  afterEach: function() {
    if (CLOCK) {
      CLOCK.restore();
    }
  },
  beforeEach: function() {
    // you could make it so that all of your tests use a fixed date & time
    // CLOCK = sinon.useFakeTimers(new Date(2001, 8, 11).getTime());
  }
})

test('when testing a fixed date', function(assert) {
  // I prefer to define my frozen time in the test for readability
  CLOCK = sinon.useFakeTimers(new Date(2001, 8, 11).getTime());
  // ... write your time-sensitive test
  // the frozen clock will be restored to system time after each test
})