Where does the browser() object is defined in angluarJS ?

Following the Angular-phonecat tutorial, step-7 in the scenario.js a browser() and binding() objects are used but, when I tried to use them to test my application, running testacular says:

ReferenceError: browser is not defined
        at null.<anonymous> 

Also Intellij Ideal says : unresolved function or method browser(). What am I missing here ?

here the code snippet from the tutorial: 'use strict';

/* http://docs.angularjs.org/guide/dev_guide.e2e-testing */

describe('PhoneCat App', function() {

  it('should redirect index.html to index.html#/phones', function() {
    browser().navigateTo('../../app/index.html');
    expect(browser().location().url()).toBe('/phones');
  });


  describe('Phone list view', function() {

    beforeEach(function() {
      browser().navigateTo('../../app/index.html#/phones'); //<---  browser() object is not defined !!! 
    });


    it('should filter the phone list as user types into the search box', function() {
      expect(repeater('.phones li').count()).toBe(20);

      input('query').enter('nexus');
      expect(repeater('.phones li').count()).toBe(1);

      input('query').enter('motorola');
      expect(repeater('.phones li').count()).toBe(8);
    });


    it('should be possible to control phone order via the drop down select box', function() {
      input('query').enter('tablet'); //let's narrow the dataset to make the test assertions shorter

      expect(repeater('.phones li', 'Phone List').column('phone.name')).
          toEqual(["Motorola XOOM\u2122 with Wi-Fi",
                   "MOTOROLA XOOM\u2122"]);

      select('orderProp').option('Alphabetical');

      expect(repeater('.phones li', 'Phone List').column('phone.name')).
          toEqual(["MOTOROLA XOOM\u2122",
                   "Motorola XOOM\u2122 with Wi-Fi"]);
    });


    it('should render phone specific links', function() {
      input('query').enter('nexus');
      element('.phones li a').click();
      expect(browser().location().url()).toBe('/phones/nexus-s');
    });
  });


  describe('Phone detail view', function() {

    beforeEach(function() {
      browser().navigateTo('../../app/index.html#/phones/nexus-s');
    });


    it('should display placeholder page with phoneId', function() {
      expect(binding('phoneId')).toBe('nexus-s');
    });
  });
});