First introduction of Ember Data without back API. not working...

app/adapters/application.js

+import DS from 'ember-data';
+
+export default DS.JSONAPIAdapter.extend({
+   namespace: 'api'
+});

app/models/rack.js

+import DS from 'ember-data';
+
+export default DS.Model.extend({
+
+});

app/routes/racks.js

 import Ember from 'ember';
 
-let racks = [
-   {
-     name: 'Standard grey Rack',
-     nbColumns: 6,
-     nbRows: 4,
-     image: './img/rack_01.jpg'
-   },
-   {
-      name: 'Traditional big Rack',
-      nbColumns: 10,
-      nbRows: 10,
-      image: './img/rack_02.jpg'
-   },
-   {
-     name: 'Small Wood Rack',
-     nbColumns: 3,
-     nbRows: 4,
-     image: './img/rack_03.jpg'
-   }
-];
-
 export default Ember.Route.extend({
    model() {
-      return racks;
-   }
+      return this.store.findAll('rack');
+ }
 });

tests/unit/adapters/application-test.js

+import { moduleFor, test } from 'ember-qunit';
+
+moduleFor('adapter:application', 'Unit | Adapter | application', {
+  // Specify the other units that are required for this test.
+  // needs: ['serializer:foo']
+});
+
+// Replace this with your real tests.
+test('it exists', function(assert) {
+  let adapter = this.subject();
+  assert.ok(adapter);
+});

tests/unit/models/rack-test.js

+import { moduleForModel, test } from 'ember-qunit';
+
+moduleForModel('rack', 'Unit | Model | rack', {
+  // Specify the other units that are required for this test.
+  needs: []
+});
+
+test('it exists', function(assert) {
+  let model = this.subject();
+  // let store = this.store();
+  assert.ok(!!model);
+});