diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
index 6c9b23b..f91c901 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
@@ -173,16 +173,11 @@ protected function setUp() {
     // Add the config directories to settings.php.
     drupal_install_config_directories();
 
-    // Install any additional modules.
-    $this->installModulesFromClassProperty($container);
-
     // Restore the original Simpletest batch.
     $this->restoreBatch();
 
-    // Rebuild and reset.
-    $this->rebuildAll();
-
     // Replace User 1 with the user created here.
+    // @todo: do this without saving the user account.
     /** @var \Drupal\user\UserInterface $account */
     $account = User::load(1);
     $account->setPassword($this->rootUser->pass_raw);