text: define([
          'Widgets/VRButton/VRButton',
          'Specs/createScene'
      ], function(
          VRButton,
          createScene) {
          'use strict';
  
  describe('Widgets/VRButton/VRButton', function() {
  
      var scene;
  
      beforeEach(function() {
          scene = createScene();
      });
  
      afterEach(function() {
          scene.destroyForSpecs();
      });
  
      it('constructor sets default values', function() {
          var vrButton = new VRButton(document.body, scene);
          expect(vrButton.container).toBe(document.body);
          expect(vrButton.viewModel.vrElement).toBe(document.body);
          expect(vrButton.isDestroyed()).toEqual(false);
          vrButton.destroy();
          expect(vrButton.isDestroyed()).toEqual(true);
      });
  
      it('constructor sets expected values', function() {
          var testElement = document.createElement('span');
          var vrButton = new VRButton(document.body, scene, testElement);
          expect(vrButton.container).toBe(document.body);
          expect(vrButton.viewModel.vrElement).toBe(testElement);
          vrButton.destroy();
      });
  
      it('constructor works with string id container', function() {
          var testElement = document.createElement('span');
          testElement.id = 'testElement';
          document.body.appendChild(testElement);
          var vrButton = new VRButton('testElement', scene);
          expect(vrButton.container).toBe(testElement);
          document.body.removeChild(testElement);
          vrButton.destroy();
      });
  
      it('throws if container is undefined', function() {
          expect(function() {
              return new VRButton(undefined, scene);
          }).toThrowDeveloperError();
      });
  
      it('throws if container string is undefined', function() {
          expect(function() {
              return new VRButton('testElement', scene);
          }).toThrowDeveloperError();
      });
  
      it('throws if scene is undefined', function() {
          expect(function() {
              return new VRButton(document.body, undefined);
          }).toThrowDeveloperError();
      });
  });
  });
  