Abbreviated version of book player page generation tests

bookpagegenerator.js

describe('BookPlayerPageGenerator()', function () {
  var bppg, dlManager, dlManagerMock;
  
  before(function () {
    // ... (omitted) set up audio and button elements and append them to body ...
    
    // Set up a dummy object with a stubbed BookDownloadManager interface
    dlManager = { downloadBook:    function (book_id, chapter_obj) {},
                  downloadChapter: function (book_obj) {} };
    
    dlManagerMock = sinon.mock(dlManager);  // setup a mock of the dlManager object
    
    // dlManager, NOT dlManagerMock, passed in args
    bookPlayerArgs = {/* other args omitted, */ 'bookDownloadManager': dlManager };
    
    bppg = new BookPlayerPageGenerator(bookPlayerArgs);
  });
  describe('#generatePage()', function () {
    it('adds onclick to the book download DOM element', function () {
      bppg.generatePage(/* ... args */); // run method
      
      dlManagerMock.expects("downloadBook").once().withExactArgs(BOOK_OBJECT); // set up expectations for mock
      $('#downloadBook').trigger('click'); // should call dlManager's #downloadBook() method matching expectations
      
      dlManagerMock.verify(); // verify that #downloadBook() has been called or fail if it hasn't
    });
  });
});