diff --git a/core/modules/system/tests/modules/form_test/form_test.routing.yml b/core/modules/system/tests/modules/form_test/form_test.routing.yml
index a37c9d8..1356bb1 100644
--- a/core/modules/system/tests/modules/form_test/form_test.routing.yml
+++ b/core/modules/system/tests/modules/form_test/form_test.routing.yml
@@ -342,6 +342,14 @@ form_test.label:
   requirements:
     _access: 'TRUE'
 
+form_test.description:
+  path: '/form_test/form-descriptions'
+  defaults:
+    _content: '\Drupal\form_test\Form\FormTestForm::testDescription'
+    _title: 'Form description test'
+  requirements:
+    _access: 'TRUE'
+
 form_test.state_persistence:
   path: '/form-test/state-persist'
   defaults:
diff --git a/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/Form/FormTestForm.php b/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/Form/FormTestForm.php
index 6fa4ab0..a3fd42b 100644
--- a/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/Form/FormTestForm.php
+++ b/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/Form/FormTestForm.php
@@ -319,6 +319,15 @@ public function testLabel() {
   }
 
   /**
+   * Wraps form_description_test_form().
+   *
+   * @todo Remove form_description_test_form().
+   */
+  public function testDescription() {
+    return drupal_get_form('form_description_test_form');
+  }
+
+  /**
    * Wraps form_test_state_persist().
    *
    * @todo Remove form_test_state_persist().