docs(aio): add e2e tests

aio/content/examples/service-worker-getstart/e2e/app.e2e-spec.ts

@@ -9,8 +9,6 @@ describe('sw-example App', () => {
     page = new AppPage();
   });
 
-
-
   it('should display welcome message', () => {
     page.navigateTo();
     expect(page.getParagraphText()).toEqual('Welcome to Service Workers!');
@@ -21,12 +19,19 @@ describe('sw-example App', () => {
     expect(logo.isPresent()).toBe(true);
   });
 
-  it('shows a list of links', function () {
-    const listItem = getListItemsStruct();
-// expect(this.listItem0.getText()).toBe('something');
-    // expect(listItem.getText()).toBe('something');
-    expect(listItem.count()).toBe(3);
-    // expect(listItem.items.get(0).getText()).toBe('Angular Service Worker Intro');
+  it('should show a header for the list of links', function () {
+    var 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(function(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');
+      });
   });
 
 });