diff -u b/core/modules/system/tests/modules/new_dependency_test/src/DecoratedDependentService.php b/core/modules/system/tests/modules/new_dependency_test/src/DecoratedDependentService.php
--- b/core/modules/system/tests/modules/new_dependency_test/src/DecoratedDependentService.php
+++ b/core/modules/system/tests/modules/new_dependency_test/src/DecoratedDependentService.php
@@ -22,7 +22,7 @@
    * @param \Drupal\new_dependency_test\DependentService|null $service
    *   The service of the same module which has the new dependency.
    */
-  public function __construct(DependentService $service = null) {
+  public function __construct(DependentService $service = NULL) {
     $this->service = $service;
   }
 
diff -u b/core/modules/system/tests/src/Functional/Update/UpdatePathNewDependencyTest.php b/core/modules/system/tests/src/Functional/Update/UpdatePathNewDependencyTest.php
--- b/core/modules/system/tests/src/Functional/Update/UpdatePathNewDependencyTest.php
+++ b/core/modules/system/tests/src/Functional/Update/UpdatePathNewDependencyTest.php
@@ -1,6 +1,8 @@
 <?php
 
-namespace Drupal\FunctionalTests\Update;
+namespace Drupal\Tests\system\Functional\Update;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
 
 /**
  * Modules can introduce new dependencies and enable them in update hooks.