diff -u b/core/tests/Drupal/Tests/Component/Utility/RectangleTest.php b/core/tests/Drupal/Tests/Component/Utility/RectangleTest.php
--- b/core/tests/Drupal/Tests/Component/Utility/RectangleTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/RectangleTest.php
@@ -73,8 +73,10 @@
    *   tricky case).
    * Using the GD toolkit operations gives us true data coming from the GD
    * library that can be used to match against the Rectangle class under test.
+   *
    * @code
-   *   protected function rotateResults($width, $height, $angle, &$new_width, &$new_height) {
+   *   protected function rotateResults($width, $height, $angle, &$new_width,
+   *   &$new_height) {
    *     $image = \Drupal::service('image.factory')->get(NULL, 'gd');
    *     $image->createNew($width, $height);
    *     $old_res = $image->getToolkit()->getResource();