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diff --git a/web/core/modules/image/tests/modules/image_module_test/src/Plugin/Field/FieldWidget/DummyAjaxWidget.php b/web/core/modules/image/tests/modules/image_module_test/src/Plugin/Field/FieldWidget/DummyAjaxWidget.php
new file mode 100644
index 000000000..4da59119a
--- /dev/null
+++ b/web/core/modules/image/tests/modules/image_module_test/src/Plugin/Field/FieldWidget/DummyAjaxWidget.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Drupal\image_module_test\Plugin\Field\FieldWidget;
+
+use Drupal\Core\Ajax\AjaxResponse;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\WidgetBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Default widget for Dummy AJAX test.
+ *
+ * @FieldWidget(
+ *   id = "image_module_test_dummy_ajax_widget",
+ *   label = @Translation("Dummy AJAX widget"),
+ *   field_types = {
+ *     "image_module_test_dummy_ajax"
+ *   },
+ *   multiple_values = TRUE,
+ * )
+ */
+class DummyAjaxWidget extends WidgetBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
+    $element['select_widget'] = [
+      '#type' => 'select',
+      '#title' => $this->t('Dummy select'),
+      '#options' => ['pow' => 'Pow!', 'bam' => 'Bam!'],
+      '#required' => TRUE,
+      '#ajax' => [
+        'callback' => get_called_class() . '::dummyAjaxCallback',
+        'effect' => 'fade',
+      ],
+    ];
+
+    return $element;
+  }
+
+  /**
+   * Ajax callback for Dummy AJAX test.
+   *
+   * @param array $form
+   *   The build form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state.
+   *
+   * @return \Drupal\Core\Ajax\AjaxResponse
+   *   Ajax response.
+   */
+  public static function dummyAjaxCallback(array &$form, FormStateInterface $form_state) {
+    return new AjaxResponse();
+  }
+
+}