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.

You can follow along by generating your own model with ember generate model player.

import Model from 'ember-data/model';
import attr from 'ember-data/attr';

export default Model.extend({
  level: attr('number', { defaultValue: 0 }),
  levelName: attr('string', { defaultValue: 'Noob' }),

  levelUp() {
    let 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:

import { moduleForModel, test } from 'ember-qunit';
import { run } from '@ember/runloop';

moduleForModel('player', 'Unit | Model | player', {
  // Specify the other units that are required for this test.
  needs: []
});

test('should increment level when told to', function(assert) {
  // this.subject aliases the createRecord method on the model
  const player = this.subject({ level: 4 });

  // wrap asynchronous call in run loop
  run(() => player.levelUp());

  assert.equal(player.get('level'), 5, 'level gets incremented');
  assert.equal(player.get('levelName'), 'Professional', 'new level is called professional');
});

Testing Relationships

import Model from 'ember-data/model';

export default Model.extend({
});

import Model from 'ember-data/model';
import { belongsTo } from 'ember-data/relationships';

export default Model.extend({
  profile: belongsTo('profile')
});

import { moduleForModel, test } from 'ember-qunit';
import { get } from "@ember/object"

moduleForModel('user', 'Unit | Model | user', {
  // Specify the other units that are required for this test.
  needs: ['model:profile']
});

test('should own a profile', function(assert) {
  const User = this.store().modelFor('user');
  const relationship = get(User, 'relationshipsByName').get('profile');

  assert.equal(relationship.key, 'profile', 'has relationship with profile');
  assert.equal(relationship.kind, 'belongsTo', 'kind of relationship is belongsTo');
});