describe('title service', () => {
   var initialTitle = DOM.getTitle();
   var titleService = new Title();
   afterEach(() => {
     DOM.setTitle(initialTitle);
   });
   it('should allow reading initial title', () => {
     expect(titleService.getTitle()).toEqual(initialTitle);
   });
   it('should set a title on the injected document', () => {
     titleService.setTitle('test title');
     expect(DOM.getTitle()).toEqual('test title');
     expect(titleService.getTitle()).toEqual('test title');
   });
   it('should reset title to empty string if title not provided', () => {
     titleService.setTitle(null);
     expect(DOM.getTitle()).toEqual('');
   });
 });

 it('should reset title to empty string if title not provided', () => {
   titleService.setTitle(null);
   expect(DOM.getTitle()).toEqual('');
 });

 () => { expect(titleService.getTitle()).toEqual(initialTitle); });

 it('should allow reading initial title', () => {
   expect(titleService.getTitle()).toEqual(initialTitle);
 });