test(docs): add protractor tests for docs app

Closes angular#5437

protractor-conf.js

@@ -3,6 +3,7 @@ exports.config = {
 
   specs: [
     'build/docs/ptore2e/**/*.js',
+    'test/e2e/docsAppE2E.js'
   ],
 
   capabilities: {

test/e2e/docsAppE2E.js

@@ -0,0 +1,40 @@
+describe('docs.angularjs.org', function () {
+  describe('App', function () {
+    // it('should filter the module list when searching', function () {
+    //   browser.get();
+    //   browser.waitForAngular();
+
+    //   var search = element(by.input('q'));
+    //   search.clear();
+    //   search.sendKeys('ngBind');
+
+    //   var firstModule = element(by.css('.search-results a'));
+    //   expect(firstModule.getText()).toEqual('ngBind');
+    // });
+
+
+    it('should change the page content when clicking a link to a service', function () {
+      browser.get('');
+
+      var ngBindLink = element(by.css('.definition-table td a[href="api/ng.directive:ngClick"]'));
+      ngBindLink.click();
+
+      var pageBody = element(by.css('.content h1 code'));
+      expect(pageBody.getText()).toEqual('ngClick');
+    });
+
+
+    it('should show the functioning input directive example', function () {
+      browser.get('index-nocache.html#!/api/ng.directive:input');
+      //Wait for animation
+      browser.sleep(500);
+
+      var nameInput = element(by.input('user.name'));
+      nameInput.click();
+      nameInput.sendKeys('!!!');
+
+      var code = element(by.css('.doc-example-live tt'));
+      expect(code.getText()).toContain('guest!!!');
+    });
+  });
+})