diff --git a/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestTestForm.php b/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestTestForm.php
index c044e13..3335ff2 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestTestForm.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestTestForm.php
@@ -140,10 +140,11 @@ public function buildForm(array $form, array &$form_state) {
           '#wrapper_attributes' => array(
             'class' => array('simpletest-test-select'),
           ),
+          '#parents' => array($class),
         );
 
         $form['tests']['table'][$test_class_id]['title'] = array(
-          '#markup' => '<label for="' . $class . '">' . $info['name'] . '</label>',
+          '#markup' => '<label for="' . $test_class_id . '">' . $info['name'] . '</label>',
           '#wrapper_attributes' => array(
             'class' => array('simpletest-test-label'),
           ),