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Testing Models


Unit testing methods and computed properties follows previous patterns shown in Unit Testing Basics because DS.Model extends Ember.Object.

Ember Data Models can be tested using the moduleForModel helper.

Let's assume we have a Player model that has level and levelName attributes. We want to call levelUp() to increment the level and assign a new levelName when the player reaches level 5.

App.Player = DS.Model.extend({
  level:     DS.attr('number', { defaultValue: 0 }),
  levelName: DS.attr('string', { defaultValue: 'Noob' }),

  levelUp: function() {
    var newLevel = this.incrementProperty('level');
    if (newLevel === 5) {
      this.set('levelName', 'Professional');      
    }
  }
});

Now let's create a test which will call levelUp on the player when they are level 4 to assert that the levelName changes. We will use moduleForModel:

moduleForModel('player', 'Player Model');

test('levelUp', function() {
  // this.subject aliases the createRecord method on the model
  var player = this.subject({ level: 4 });

  // wrap asynchronous call in run loop
  Ember.run(function() {
    player.levelUp();
  });

  equal(player.get('level'), 5);
  equal(player.get('levelName'), 'Professional');
});

Live Example

Unit Testing Ember Data Models

Testing Relationships

For relationships you probably only want to test that the relationship declarations are setup properly.

Assume that a User can own a Profile.

App.Profile = DS.Model.extend({});

App.User = DS.Model.extend({
  profile: DS.belongsTo('profile')
});

Then you could test that the relationship is wired up correctly with this test.

moduleForModel('user', 'User Model', {
  needs: ['model:profile']
});

test('profile relationship', function() {
  var User = this.store().modelFor('user');
  var relationship = Ember.get(User, 'relationshipsByName').get('profile');

  equal(relationship.key, 'profile');
  equal(relationship.kind, 'belongsTo');
});

Live Example

Unit Testing Models (Relationships : One-to-One)

Ember Data contains extensive tests around the functionality of relationships, so you probably don't need to duplicate those tests. You could look at the Ember Data tests for examples of deeper relationship testing if you feel the need to do it.