diff --git a/core/modules/system/src/Tests/Form/ElementTest.php b/core/modules/system/src/Tests/Form/ElementTest.php
index 6555a4f..07cf1e9 100644
--- a/core/modules/system/src/Tests/Form/ElementTest.php
+++ b/core/modules/system/src/Tests/Form/ElementTest.php
@@ -160,4 +160,13 @@ public function testFormAutocomplete() {
     $this->assertEqual(count($result), 1, 'Ensure that the user does have access to the autocompletion');
   }
 
+  /**
+   * Tests form element error messages.
+   */
+  public function testFormElementErrors() {
+    $edit = ['error_on_details' => '1'];
+    $this->drupalPostForm('form-test/group-container', $edit, 'Submit');
+    $this->assertText('I am an error on the details element.');
+  }
+
 }
diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php
index 26a04c4..5ffd00c 100644
--- a/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php
@@ -39,12 +39,26 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#type' => 'textfield',
       '#title' => 'Nest in details element',
     );
+    $form['error_on_details'] = array(
+      '#type' => 'checkbox',
+      '#title' => 'Show error on details',
+    );
+    $form['submit'] = array('#type' => 'submit', '#value' => 'Submit');
     return $form;
   }
 
   /**
    * {@inheritdoc}
    */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    if ($form_state->getValue('error_on_details') == True) {
+      $form_state->setErrorByName('meta', 'I am an error on the details element.');
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function submitForm(array &$form, FormStateInterface $form_state) {
   }