drupalCreateUser(); // Switch the user. \Drupal::service('account_switcher')->switchTo($account); $view = Views::getView('test_plugin_argument_default_current_user'); $view->initHandlers(); $this->assertEqual($view->argument['null']->getDefaultArgument(), $account->id(), 'Uid of the current user is used.'); // Switch back. \Drupal::service('account_switcher')->switchBack(); } }