doc(testing/http_authentication.rst);

- [x] Added notes for people using Guard with the
PostAuthenticationGuardToken

Author: Sydney-o9

testing/http_authentication.rst

@@ -126,3 +126,64 @@ needs::
             $this->client->getCookieJar()->set($cookie);
         }
     }
+
+Note: Are you using Guard? You may adjust the token depending on your application needs. 
+For example, if you are using Guard for authentication, you would use the `PostAuthenticationGuardToken`:
+
+    // tests/Controller/DefaultControllerTest.php
+    namespace App\Tests\Controller;
+
+    use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+    use Symfony\Component\BrowserKit\Cookie;
+    use Symfony\Component\HttpFoundation\Response;
+    use Symfony\Component\Security\Guard\Token\PostAuthenticationGuardToken;
+
+    class DefaultControllerTest extends WebTestCase
+    {
+        private $client = null;
+
+        private $user = null;
+
+        public function setUp()
+        {
+            $this->client = static::createClient();
+            $this->user = $this->createUser()
+        }
+
+        private function createUser() {
+
+            // create your user, save it and return it
+            // ...
+
+            return $user;
+        }
+
+        public function testSecuredHello()
+        {
+            $this->logInAsUser($user);
+            $crawler = $this->client->request('GET', '/admin');
+
+            $this->assertSame(Response::HTTP_OK, $this->client->getResponse()->getStatusCode());
+            $this->assertSame('Admin Dashboard', $crawler->filter('h1')->text());
+        }
+
+
+        protected function logInAsUser(UserInterface $user)
+        {
+            $session = $this->client->getContainer()->get('session');
+
+            // the firewall context defaults to the firewall name
+            $firewallContext = 'secured_area';
+            $token = new PostAuthenticationGuardToken(
+                $user,
+                $firewallContext,
+                array('ROLE_ADMIN')
+            );
+            $session->set('_security_'.$firewallContext, serialize($token));
+            $session->save();
+
+            $cookie = new Cookie($session->getName(), $session->getId());
+            $this->client->getCookieJar()->set($cookie);
+        }
+ 
+