EmberJS-Testing Components Setup

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Description

To test your Ember application, you need to add testing application by using div tag in the html file as shown below:

<div id ="ember-testing"></div>

To render your application, Ember uses this id element as shown below −

App.rootElement = '#ember-testing'

Example

<!DOCTYPE html>
<html>
   <head>
      <title>Emberjs  Testing Components</title>
      <!-- CDN's -->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.1/handlebars.min.js"></script>
      <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
      <script src="https://builds.emberjs.com/tags/v1.10.0-beta.3/ember-template-compiler.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.10.0/ember.prod.js"></script>
      <script src="https://code.jquery.com/qunit/qunit-1.18.0.js"></script>
      <script src="https://rawgit.com/rwjblue/ember-qunit-builds/master/ember-qunit.js"></script>
      <script src="https://builds.emberjs.com/release/ember.debug.js"></script>
      <script src="https://builds.emberjs.com/beta/ember-data.js"></script>
   </head>
   <body>
      <div id="qunit"></div>
      <div id="ember-testing"></div>

      <script type="text/x-handlebars">
         <h2>Welcome to Ember.js</h2>
         {{outlet}}
      </script>

      <script type="text/x-handlebars" data-template-name="index">
         <ul>
            {{#each item in model}}
               <li>{{my-color name=item}}</li>
            {{/each}}
         </ul>
      </script>

      <script type="text/x-handlebars" data-template-name="components/my-color">
         My Color: {{name}}
      </script>

      <script type="text/javascript">
         //Creates an instance of Ember.Application and assign it to a global variable
         App = Ember.Application.create();

         //Customize the behavior of a route by creating an 'Ember.Route' subclass
         App.IndexRoute = Ember.Route.extend({
            //If you want to render a template with the route handler, implement the 'model' hook
            model: function() {
               return ['red', 'yellow', 'blue'];
            }
         });

         App.myColorComponent = Ember.Component.extend({
            templateName: 'my-color',
            style: function() {
               return 'color: ' + this.get('name') + ';';
            }.property('name')
         });

         //These methods are used to prepare the application for testing
         //emq.globalize();
         App.setupForTesting();
         App.rootElement = '#ember-testing';   //Ember.js applications's root element
         setResolver(Ember.DefaultResolver.create({ namespace: App }));

         //Test the component done using the 'moduleForComponent' helper and will find the component by name(my-color)
         moduleForComponent('my-color');
         test("changing colors", function(){
            //'this.subject()' is available because we used 'moduleForComponent'
            var component = this.subject();
            //This is an async function and should be wrapped using 'Ember.run'
            Ember.run(function(){
               component.set('name','red');
            });

            //First call to $() renders the component
            equal(this.$().attr('style'), 'color: red;');

            Ember.run(function(){
               component.set('name', 'green');
            });
            equal(this.$().attr('style'), 'color: green;');
         });

         test("template", function(){
            var component = this.subject();   //'this.subject()' is available because we used 'moduleForComponent'
            //First call to $() renders the component
            equal($.trim(this.$().text()), 'My Color:');
            //This is another async function and should be wrapped using 'Ember.run'
            Ember.run(function(){
               component.set('name', 'green');
            });
            equal($.trim(this.$().text()), 'My Color: green');
         });
      </script>
   </body>
</html>

Output

Let's carry out the following steps to see how above code works −

  • Save above code in testing_setup.htm file

  • Open this HTML file in a browser.

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