old_contents: /*global affix, selector*/
  
  describe('Selector', function() {
    'use strict';
  
    beforeEach(function() {
      affix('.learn-query-testing #toddler .hidden.toy+h1[class="title"]+span[class="subtitle"]+span[class="subtitle"]+input[name="toyName"][value="cuddle bunny"]+input[class="creature"][value="unicorn"]+.hidden+.infinum[value="awesome cool"]');
    });
  
    it('should select an empty array if the element does not exist in DOM', function() {
      var selector = '.some-element-not-in-the-dom';
  
      // We're calling $.makeArray because we need to transform jQuery result set into real array object
      var expectedSelectedElement = $.makeArray($(selector));
      var selectedElement = domSelector();
  
      expect(selectedElement).toEqual(expectedSelectedElement);
      expect(selectedElement.length).toBe(0);
    });
  
    it('should select a DOM element with given ID', function() {
      var id = 'toddler';
      var expectedSelectedElement = $.makeArray($('#' + id));
      var selectedElement = domSelector('#' + id);
  
      expect(selectedElement).toEqual(expectedSelectedElement);
      expect(selectedElement.length).toBe(1);
      expect(selectedElement[0] instanceof HTMLElement).toBe(true);
      expect(selectedElement[0]).toBe(expectedSelectedElement[0]);
      expect(selectedElement[0].id).toBe(id);
    });
  
    it('should select DOM elements with a given class name', function() {
      var className = '.infinum';
      var selectedElementsArray = domSelector(className);
      var expectedHTMLElementsArray = $.makeArray($(className));
  
      expect(selectedElementsArray.length).toBe(expectedHTMLElementsArray.length);
  
      // We need to check for each element if it's in the expected result set because element order is not guaranteed
      selectedElementsArray.forEach(function(element) {
        expect(expectedHTMLElementsArray.indexOf(element)).not.toBe(-1);
      });
    });
  
    it('should select DOM elements with a given tag name', function() {
      var tagName = 'input';
      var selectedElementsArray = domSelector(tagName);
      var expectedHTMLElementsArray = $.makeArray($(tagName));
  
      selectedElementsArray.forEach(function(element) {
        expect(expectedHTMLElementsArray.indexOf(element)).not.toBe(-1);
      });
    });
  
    it('should throw an expection for invalid selector', function() {
      expect(function() {
        domSelector(')(?/');
      }).toThrowError();
    });
  });
new_contents: /*global affix, selector*/
  
  describe('Selector', function() {
    'use strict';
  
    beforeEach(function() {
      affix('.learn-query-testing #toddler .hidden.toy+h1[class="title"]+span[class="subtitle"]+span[class="subtitle"]+input[name="toyName"][value="cuddle bunny"]+input[class="creature"][value="unicorn"]+.hidden+.infinum[value="awesome cool"]');
    });
  
    it('should select an empty array if the element does not exist in DOM', function() {
      var selector = '.some-element-not-in-the-dom';
  
      // We're calling $.makeArray because we need to transform jQuery result set into real array object
      var expectedSelectedElement = $.makeArray($(selector));
      var selectedElement = domSelector(selector);
  
      expect(selectedElement).toEqual(expectedSelectedElement);
      expect(selectedElement.length).toBe(0);
    });
  
    it('should select a DOM element with given ID', function() {
      var id = 'toddler';
      var expectedSelectedElement = $.makeArray($('#' + id));
      var selectedElement = domSelector('#' + id);
  
      expect(selectedElement).toEqual(expectedSelectedElement);
      expect(selectedElement.length).toBe(1);
      expect(selectedElement[0] instanceof HTMLElement).toBe(true);
      expect(selectedElement[0]).toBe(expectedSelectedElement[0]);
      expect(selectedElement[0].id).toBe(id);
    });
  
    it('should select DOM elements with a given class name', function() {
      var className = '.infinum';
      var selectedElementsArray = domSelector(className);
      var expectedHTMLElementsArray = $.makeArray($(className));
  
      expect(selectedElementsArray.length).toBe(expectedHTMLElementsArray.length);
  
      // We need to check for each element if it's in the expected result set because element order is not guaranteed
      selectedElementsArray.forEach(function(element) {
        expect(expectedHTMLElementsArray.indexOf(element)).not.toBe(-1);
      });
    });
  
    it('should select DOM elements with a given tag name', function() {
      var tagName = 'input';
      var selectedElementsArray = domSelector(tagName);
      var expectedHTMLElementsArray = $.makeArray($(tagName));
  
      selectedElementsArray.forEach(function(element) {
        expect(expectedHTMLElementsArray.indexOf(element)).not.toBe(-1);
      });
    });
  
    it('should throw an expection for invalid selector', function() {
      expect(function() {
        domSelector(')(?/');
      }).toThrowError();
    });
  });
  
subject: Fix mistake in test for task 01