diff --git a/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageBase.php b/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageBase.php
index d03ca71..062b857 100644
--- a/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageBase.php
+++ b/core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageBase.php
@@ -28,8 +28,10 @@
    */
   protected $secret;
 
-
-  function setUp() {
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
     parent::setUp();
 
     $this->secret = $this->randomName();
@@ -44,7 +46,7 @@ function setUp() {
   /**
    * Tests basic load/save/delete operations.
    */
-  function testCRUD() {
+  public function testCRUD() {
     $php = $this->storageFactory->get('simpletest');
     $this->assertSame(get_class($php), $this->storageClass);
     $this->assertCRUD($php);
@@ -59,7 +61,7 @@ function testCRUD() {
    * We need to delay over 1 second for mtime test.
    * @medium
    */
-  function testSecurity() {
+  public function testSecurity() {
     $php = $this->storageFactory->get('simpletest');
     $name = 'simpletest.php';
     $php->save($name, '<?php');