docs(aio): Upgrade examples to Angular 6 (#23234)

PR Close #23234

aio/content/examples/service-worker-getting-started/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,44 @@
+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: ');
+  });
+});