title: 'equal' is not defined : Ember-qunit does not seem to be importing
body: <p>It appears the Qunit test methods aren't available even though I'm pretty sure I am importing them correctly. </p>
  
  <p>I get the following errors:</p>
  
  <pre><code>unit/models/friend-test.js: line 11, col 3, 'ok' is not defined.
  unit/models/friend-test.js: line 17, col 3, 'equal' is not defined.
  unit/models/friend-test.js: line 23, col 3, 'equal' is not defined.
  unit/models/friend-test.js: line 31, col 3, 'equal' is not defined.
  unit/models/friend-test.js: line 32, col 3, 'equal' is not defined.
  </code></pre>
  
  <p>I have this test file <code>unit/models/friend-test</code>:</p>
  
  <pre><code>import Ember from 'ember';
  import { moduleForModel,  test } from 'ember-qunit';
  
  
  moduleForModel('friend', 'Friend', {
    needs: ['model:article']
  });
  
  test('it exists', function() {
    var model = this.subject();
    ok(model);
  });
  
  test('fullName concats first and last name', function() {
    var model = this.subject({firstName: 'Syd', lastName: 'Barrett'});
  
    equal(model.get('fullName'), 'Syd Barrett');
  
    Ember.run(function() {
      model.set('firstName', 'Geddy');
    });
  
    equal(model.get('fullName'), 'Geddy Barrett', 'Updates fullName');
  });
  
  test('articles relationship', function() {
    var klass  = this.subject({}).constructor;
  
    var relationship = Ember.get(klass, 'relationshipsByName').get('articles');
  
    equal(relationship.key, 'articles');
    equal(relationship.kind, 'hasMany');
  });
  </code></pre>
  
  <p>I'm working through "<a href="https://leanpub.com/ember-cli-101" rel="noreferrer">Ember CLI 101</a>"</p>