angular-docs-cn/aio/content/examples/service-worker-getting-started/e2e/app.e2e-spec.ts

import { AppPage } from './app.po';
import { browser, element, by } from 'protractor';


describe('sw-example App', () => {
  let page: AppPage;

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

  it('should display welcome message', () => {
    page.navigateTo();
    expect(page.getParagraphText()).toEqual('Welcome to Service Workers!');
  });

  it('should display the Angular logo', () => {
    let logo = element(by.css('img'));
    page.navigateTo();
    expect(logo.isPresent()).toBe(true);
  });

  it('should show a header for the list of links', () => {
    const listHeader = element(by.css('app-root > h2'));
    expect(listHeader.getText()).toEqual('Here are some links to help you start:');
  });

  it('should show a list of links', function () {
      element.all(by.css('ul > li > h2 > a')).then((items) => {
        expect(items.length).toBe(4);
        expect(items[0].getText()).toBe('Angular Service Worker Intro');
        expect(items[1].getText()).toBe('Tour of Heroes');
        expect(items[2].getText()).toBe('CLI Documentation');
        expect(items[3].getText()).toBe('Angular blog');
      });
  });
   // Check for a rejected promise as the service worker is not enabled
   it('SwUpdate.checkForUpdate() should return a rejected promise', () => {
    const button = element(by.css('button'));
    const rejectMessage = element(by.css('p'));
    button.click();
    expect(rejectMessage.getText()).toContain('rejected: ');
  });
});