/**
  * Overrides \Drupal\Core\Config\Entity\ConfigEntityStorage::importUpdate().
  */
 public function importUpdate($name, Config $new_config, Config $old_config)
 {
     // Set a global value we can check in test code.
     $GLOBALS['hook_config_import'] = __METHOD__;
     return parent::importUpdate($name, $new_config, $old_config);
 }