diff -u b/core/modules/responsive_image/tests/src/Functional/ViewsIntegrationTest.php b/core/modules/responsive_image/tests/src/Functional/ViewsIntegrationTest.php
--- b/core/modules/responsive_image/tests/src/Functional/ViewsIntegrationTest.php
+++ b/core/modules/responsive_image/tests/src/Functional/ViewsIntegrationTest.php
@@ -22,7 +22,17 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['views', 'views_ui', 'responsive_image', 'field', 'image', 'file', 'entity_test', 'breakpoint', 'responsive_image_test_module'];
+  public static $modules = [
+    'views',
+    'views_ui',
+    'responsive_image',
+    'field',
+    'image',
+    'file',
+    'entity_test',
+    'breakpoint',
+    'responsive_image_test_module',
+  ];
 
   /**
    * The test views to enable.
@@ -62,7 +72,7 @@
       ])
       ->addImageStyleMapping('responsive_image_test_module.narrow', '1x', [
         'image_mapping_type' => 'image_style',
-        'image_mapping' => 'medium'
+        'image_mapping' => 'medium',
       ])
       // Test the normal output of mapping to an image style.
       ->addImageStyleMapping('responsive_image_test_module.wide', '1x', [
@@ -84,11 +94,13 @@
     $this->drupalPostForm('admin/structure/views/nojs/add-handler/entity_test_row/default/field', ['name[entity_test__bar.bar]' => TRUE], 'Add and configure field');
     // Set the formatter to 'Responsive image'.
     $this->drupalPostForm(NULL, ['options[type]' => 'responsive_image'], 'Apply');
-    $this->assertSession()->responseContains('Responsive image style field is required.');
+    $this->assertSession()
+      ->responseContains('Responsive image style field is required.');
     $this->drupalPostForm(NULL, ['options[settings][responsive_image_style]' => self::RESPONSIVE_IMAGE_STYLE_ID], 'Apply');
     $this->drupalGet('admin/structure/views/nojs/handler/entity_test_row/default/field/bar');
     // Make sure the selected value is set.
-    $this->assertSession()->fieldValueEquals('options[settings][responsive_image_style]', self::RESPONSIVE_IMAGE_STYLE_ID);
+    $this->assertSession()
+      ->fieldValueEquals('options[settings][responsive_image_style]', self::RESPONSIVE_IMAGE_STYLE_ID);
   }
 
 }