diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestDescriptionForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestDescriptionForm.php
new file mode 100644
index 0000000..65df1e6
--- /dev/null
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestDescriptionForm.php
@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\form_test\Form\FormTestEmailForm.
+ */
+
+namespace Drupal\form_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+
+/**
+ * Form for testing the different positions of the description in an element.
+ */
+class FormTestDescriptionForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'form_test_description_display';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+  $form['form_textfield_test_description_before'] = array(
+    '#type' =>'textfield',
+    '#title' => 'Textfield test for description before element',
+    '#description' => 'Textfield test for description before element',
+    '#description_display' => 'before',
+  );
+
+  $form['form_textfield_test_description_after'] = array(
+    '#type' =>'textfield',
+    '#title' => 'Textfield test for description after element',
+    '#description' => 'Textfield test for description after element',
+    '#description_display' => 'after',
+  );
+
+  $form['form_textfield_test_description_invisible'] = array(
+    '#type' =>'textfield',
+    '#title' => 'Textfield test for visually-hidden description',
+    '#description' => 'Textfield test for visually-hidden description',
+    '#description_display' => 'invisible',
+  );
+
+  return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+
+  }
+
+}