diff -u b/core/modules/language/tests/language_test/lib/Drupal/language_test/LanguageTestManager.php b/core/modules/language/tests/language_test/lib/Drupal/language_test/LanguageTestManager.php
--- b/core/modules/language/tests/language_test/lib/Drupal/language_test/LanguageTestManager.php
+++ b/core/modules/language/tests/language_test/lib/Drupal/language_test/LanguageTestManager.php
@@ -19,8 +19,8 @@
    * Constructs a LanguageTestManager object.
    */
   public function __construct(Request $request = NULL) {
-    if (state()->get('language_test.domain')) {
-      $_SERVER['HTTP_HOST'] = state()->get('language_test.domain');
+    if ($test_domain = state()->get('language_test.domain')) {
+      $_SERVER['HTTP_HOST'] = $test_domain;
     }
     return parent::__construct($request);
   }
diff -u b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/EventSubscriber/SessionTestSubscriber.php b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/EventSubscriber/SessionTestSubscriber.php
--- b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/EventSubscriber/SessionTestSubscriber.php
+++ b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/EventSubscriber/SessionTestSubscriber.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\session_test\EventSubscriber\SessionTestSubscriber.
+ * Contains \Drupal\session_test\EventSubscriber\SessionTestSubscriber.
  */
 
 namespace Drupal\session_test\EventSubscriber;
@@ -12,10 +12,8 @@
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
-
-
 /**
- * Ban subscriber for controller requests.
+ * Defines a test session subscriber that checks whether the session is empty.
  */
 class SessionTestSubscriber implements EventSubscriberInterface {
 
@@ -27,7 +25,7 @@
   /**
    * Set header for session testing.
    *
-   * @param Symfony\Component\HttpKernel\Event\GetResponseEvent $event
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
    *   The Event to process.
    */
   public function onKernelRequestSessionTest(GetResponseEvent $event) {
@@ -37,7 +35,7 @@
   /**
    * Set header for session testing.
    *
-   * @param Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
+   * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
    *   The Event to process.
    */
   public function onKernelResponseSessionTest(FilterResponseEvent $event) {
diff -u b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/SessionTestBundle.php b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/SessionTestBundle.php
--- b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/SessionTestBundle.php
+++ b/core/modules/system/tests/modules/session_test/lib/Drupal/session_test/SessionTestBundle.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\session_test\SessionTestBundle.
+ * Contains \Drupal\session_test\SessionTestBundle.
  */
 
 namespace Drupal\session_test;
@@ -16,7 +16,7 @@
 class SessionTestBundle extends Bundle {
 
   /**
-   * Overrides Symfony\Component\HttpKernel\Bundle\Bundle::build().
+   * Overrides \Symfony\Component\HttpKernel\Bundle\Bundle::build().
    */
   public function build(ContainerBuilder $container) {
     $container->register('session_test.subscriber', 'Drupal\session_test\EventSubscriber\SessionTestSubscriber')
only in patch2:
unchanged:
--- a/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php
+++ b/core/modules/language/lib/Drupal/language/Tests/LanguageUILanguageNegotiationTest.php
@@ -59,6 +59,7 @@ public static function getInfo() {
 
   function setUp() {
     parent::setUp();
+
     require_once DRUPAL_ROOT . '/core/includes/language.inc';
     $admin_user = $this->drupalCreateUser(array('administer languages', 'translate interface', 'access administration pages', 'administer blocks'));
     $this->drupalLogin($admin_user);