diff --git a/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterTwigExtensionsPass.php b/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterTwigExtensionsPass.php
index 09876b0..5b4a7fa 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterTwigExtensionsPass.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterTwigExtensionsPass.php
@@ -23,7 +23,8 @@ public function process(ContainerBuilder $container) {
     $definition = $container->getDefinition('twig');
 
     foreach ($container->findTaggedServiceIds('twig.extension') as $id => $attributes) {
-      // We must assume that the class value has been correcly filled, even if the service is created by a factory
+      // We must assume that the class value has been correcly filled,
+      // even if the service is created by a factory.
       $class = $container->getDefinition($id)->getClass();
 
       $refClass = new ReflectionClass($class);
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/TwigExtensionTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/TwigExtensionTest.php
index 010825e..e488f00 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/TwigExtensionTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/TwigExtensionTest.php
@@ -41,8 +41,8 @@ function testTwigExtensionLoaded() {
     $twigService = \Drupal::service('twig');
     $ext = $twigService->getExtension('twig_extension_test.test_extension');
     $this->assertEqual(
-      get_class($ext), 
-      'Drupal\twig_extension_test\TwigExtension\TestExtension', 
+      get_class($ext),
+      'Drupal\twig_extension_test\TwigExtension\TestExtension',
       'TestExtension loaded successfully.'
     );
   }
@@ -57,11 +57,11 @@ function testTwigExtensionFilter() {
 
     $this->drupalGet('twig-extension-test/filter');
     $this->assertNoText(
-      'If you are seeing this, the theme is still using phptemplate and the test has failed.', 
+      'If you are seeing this, the theme is still using phptemplate and the test has failed.',
       'Success: Using Twig template.'
     );
     $this->assertText(
-      'Every plant is not a mineral.', 
+      'Every plant is not a mineral.',
       'Success: String filtered.'
     );
   }
@@ -76,15 +76,15 @@ function testTwigExtensionFunction() {
 
     $out = $this->drupalGet('twig-extension-test/function');
     $this->assertNoText(
-      'If you are seeing this, the theme is still using phptemplate and the test has failed.', 
+      'If you are seeing this, the theme is still using phptemplate and the test has failed.',
       'Success: Using Twig template.'
     );
     $this->assertText(
-      'THE QUICK BROWN BOX JUMPS OVER THE LAZY DOG 123.', 
+      'THE QUICK BROWN BOX JUMPS OVER THE LAZY DOG 123.',
       'Success: Text converted to uppercase.'
     );
     $this->assertText(
-      'the quick brown box jumps over the lazy dog 123.', 
+      'the quick brown box jumps over the lazy dog 123.',
       'Success: Text converted to lowercase.'
     );
     $this->assertNoText(
diff --git a/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.filter.tpl.php b/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.filter.tpl.php
index 153ec2b..c8bb4e8 100644
--- a/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.filter.tpl.php
+++ b/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.filter.tpl.php
@@ -1,3 +1,3 @@
 <p>
   If you are seeing this, the theme is still using phptemplate and the test has failed.
-</p>
\ No newline at end of file
+</p>
diff --git a/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.function.tpl.php b/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.function.tpl.php
index 153ec2b..c8bb4e8 100644
--- a/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.function.tpl.php
+++ b/core/modules/system/tests/modules/twig_extension_test/templates/twig_extension_test.function.tpl.php
@@ -1,3 +1,3 @@
 <p>
   If you are seeing this, the theme is still using phptemplate and the test has failed.
-</p>
\ No newline at end of file
+</p>
diff --git a/core/modules/system/tests/modules/twig_extension_test/twig_extension_test.module b/core/modules/system/tests/modules/twig_extension_test/twig_extension_test.module
index bbbf2a0..ae3723a 100644
--- a/core/modules/system/tests/modules/twig_extension_test/twig_extension_test.module
+++ b/core/modules/system/tests/modules/twig_extension_test/twig_extension_test.module
@@ -6,7 +6,7 @@
 function twig_extension_test_theme($existing, $type, $theme, $path) {
   return array(
     'twig_extension_test_filter' => array(
-      'variables' => array('message' => NULL), 
+      'variables' => array('message' => NULL),
       'template' => 'twig_extension_test.filter',
     ),
     'twig_extension_test_function' => array(