diff --git a/core/modules/editor/tests/modules/src/Plugin/Editor/UnicornEditor.php b/core/modules/editor/tests/modules/src/Plugin/Editor/UnicornEditor.php
index b7b200e28b..49f1ea2881 100644
--- a/core/modules/editor/tests/modules/src/Plugin/Editor/UnicornEditor.php
+++ b/core/modules/editor/tests/modules/src/Plugin/Editor/UnicornEditor.php
@@ -33,7 +33,7 @@ public function getDefaultSettings() {
   /**
    * {@inheritdoc}
    */
-  public function settingsForm(array $form, FormStateInterface $form_state, Editor $editor) {
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
     $form['ponies_too'] = [
       '#title' => t('Pony mode'),
       '#type' => 'checkbox',
@@ -45,6 +45,18 @@ public function settingsForm(array $form, FormStateInterface $form_state, Editor
   /**
    * {@inheritdoc}
    */
+  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getJSSettings(Editor $editor) {
     $js_settings = [];
     $settings = $editor->getSettings();