diff --git a/core/modules/system/tests/modules/form_test/form_test.info b/core/modules/system/tests/modules/form_test/form_test.info
index 5354350..d2a96a0 100644
--- a/core/modules/system/tests/modules/form_test/form_test.info
+++ b/core/modules/system/tests/modules/form_test/form_test.info
@@ -3,4 +3,4 @@ description = "Support module for Form API tests."
 package = Testing
 version = VERSION
 core = 8.x
-hidden = TRUE
+
diff --git a/core/modules/system/tests/modules/form_test/form_test.module b/core/modules/system/tests/modules/form_test/form_test.module
index 86e810d..05c0677 100644
--- a/core/modules/system/tests/modules/form_test/form_test.module
+++ b/core/modules/system/tests/modules/form_test/form_test.module
@@ -458,6 +458,12 @@ function form_test_validate_required_form($form, &$form_state) {
     '#title' => 'Radios (optional)',
     '#options' => $options,
   );
+  $form['radios_optional_default_value_false'] = array(
+    '#type' => 'radios',
+    '#title' => 'Radios (optional, with a default value of FALSE)',
+    '#options' => $options,
+    '#default_value' => FALSE,
+  );
   $form['actions'] = array('#type' => 'actions');
   $form['actions']['submit'] = array('#type' => 'submit', '#value' => 'Submit');
   return $form;
@@ -638,12 +644,13 @@ function _form_test_tableselect_form_builder($form, $form_state, $element_proper
   list($header, $options) = _form_test_tableselect_get_data();
 
   $form['tableselect'] = $element_properties;
-
+dpm($options);
   $form['tableselect'] += array(
     '#type' => 'tableselect',
     '#header' => $header,
     '#options' => $options,
     '#multiple' => FALSE,
+    '#required' => TRUE,
     '#empty' => t('Empty text.'),
   );