angular-cn/angular.io/e2e/app.e2e-spec.ts

import { SitePage } from './app.po';

describe('site App', function() {
  let page: SitePage;

  beforeEach(() => {
    page = new SitePage();
  });

  it('should show features text after clicking "Features"', () => {
    page.navigateTo()
      .then(() => {
        return page.featureLink.click();
      })
      .then(() => {
        expect(page.getDocViewerText()).toContain('Progressive web apps');
      });
  });
});