diff --git a/core/modules/file/tests/src/Kernel/FileUrlTest.php b/core/modules/file/tests/src/Kernel/FileUrlTest.php
index 832b3db83c..573fe25444 100644
--- a/core/modules/file/tests/src/Kernel/FileUrlTest.php
+++ b/core/modules/file/tests/src/Kernel/FileUrlTest.php
@@ -2,8 +2,6 @@
 
 namespace Drupal\Tests\file\Kernel;
 
-use Drupal\Core\Site\Settings;
-
 /**
  * Tests the file url.
  *
@@ -16,7 +14,7 @@ class FileUrlTest extends FileManagedUnitTestBase {
    */
   public function testFilesUrlWithDifferentHostName() {
     $test_base_url = 'http://www.example.com/cdn';
-    $this->settingsSet('file_public_base_url', $test_base_url);
+    $this->setSetting('file_public_base_url', $test_base_url);
     $filepath = file_create_filename('test.txt', '');
     $directory_uri = 'public://' . dirname($filepath);
     file_prepare_directory($directory_uri, FILE_CREATE_DIRECTORY);
@@ -26,20 +24,4 @@ public function testFilesUrlWithDifferentHostName() {
     $this->assertSame($url, $expected_url);
   }
 
-  /**
-   * Changes in memory settings.
-   *
-   * @param string $name
-   *   The name of the setting to return.
-   * @param string $value
-   *   The value of the setting.
-   *
-   * @see \Drupal\Core\Site\Settings::get()
-   */
-  protected function settingsSet($name, $value) {
-    $settings = Settings::getAll();
-    $settings[$name] = $value;
-    new Settings($settings);
-  }
-
 }