docs(aio): add NgModule docs (#20306)

PR Close #20306

aio/content/examples/lazy-loading/e2e/app.e2e-spec.ts

@@ -0,0 +1,47 @@
+import { AppPage } from './app.po';
+import { browser, element, by } from 'protractor';
+
+
+describe('providers App', () => {
+  let page: AppPage;
+  const buttons = element.all(by.css('button'));
+  const customersButton = buttons.get(0);
+  const ordersButton = buttons.get(1);
+  const homeButton = buttons.get(2);
+
+  beforeEach(() => {
+    page = new AppPage();
+  });
+
+  it('should display message saying app works', () => {
+    page.navigateTo();
+    expect(page.getParagraphText()).toEqual('Lazy loading feature modules');
+  });
+
+  describe('Customers list', function() {
+    beforeEach(function() {
+      customersButton.click();
+    });
+
+    it('should show customers list when the button is clicked', function() {
+        let customersMessage = element(by.css('app-customer-list > p'));
+        expect(customersMessage.getText()).toBe('customer-list works!');
+    });
+
+  });
+
+  describe('Orders list', function() {
+    beforeEach(function() {
+      ordersButton.click();
+    });
+
+    it('should show orders list when the button is clicked', function() {
+        let ordersMessage = element(by.css('app-order-list > p'));
+        expect(ordersMessage.getText()).toBe('order-list works!');
+    });
+
+  });
+
+});
+
+