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diff --git a/web/core/modules/system/tests/modules/ajax_forms_test/src/Form/AjaxFormsTestSimpleForm.php b/web/core/modules/system/tests/modules/ajax_forms_test/src/Form/AjaxFormsTestSimpleForm.php
new file mode 100644
index 000000000..f69a12323
--- /dev/null
+++ b/web/core/modules/system/tests/modules/ajax_forms_test/src/Form/AjaxFormsTestSimpleForm.php
@@ -0,0 +1,121 @@
+<?php
+
+namespace Drupal\ajax_forms_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\ajax_forms_test\Callbacks;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form builder: Builds a form that triggers a simple AJAX callback.
+ */
+class AjaxFormsTestSimpleForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'ajax_forms_test_simple_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $object = new Callbacks();
+
+    $form = [];
+    $form['select'] = [
+      '#title' => $this->t('Color'),
+      '#type' => 'select',
+      '#options' => [
+        'red' => 'red',
+        'green' => 'green',
+        'blue' => 'blue'],
+      '#ajax' => [
+        'callback' => [$object, 'selectCallback'],
+      ],
+      '#suffix' => '<div id="ajax_selected_color">No color yet selected</div>',
+    ];
+
+    $form['checkbox'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Test checkbox'),
+      '#ajax' => [
+        'callback' => [$object, 'checkboxCallback'],
+      ],
+      '#suffix' => '<div id="ajax_checkbox_value">No action yet</div>',
+    ];
+    $form['submit'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('submit'),
+    ];
+
+    // This is for testing invalid callbacks that should return a 500 error in
+    // \Drupal\Core\Form\FormAjaxResponseBuilderInterface::buildResponse().
+    $invalid_callbacks = [
+      'null' => NULL,
+      'empty' => '',
+      'nonexistent' => 'some_function_that_does_not_exist',
+    ];
+    foreach ($invalid_callbacks as $key => $value) {
+      $form['select_' . $key . '_callback'] = [
+        '#type' => 'select',
+        '#title' => $this->t('Test %key callbacks', ['%key' => $key]),
+        '#options' => ['red' => 'red'],
+        '#ajax' => ['callback' => $value],
+      ];
+    }
+
+    $form['test_group'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Test group'),
+      '#open' => TRUE,
+    ];
+
+    // Test ajax element in a #group.
+    $form['checkbox_in_group_wrapper'] = [
+      '#type' => 'container',
+      '#attributes' => ['id' => 'checkbox-wrapper'],
+      '#group' => 'test_group',
+      'checkbox_in_group' => [
+        '#type' => 'checkbox',
+        '#title' => $this->t('AJAX checkbox in a group'),
+        '#ajax' => [
+          'callback' => [$object, 'checkboxGroupCallback'],
+          'wrapper' => 'checkbox-wrapper',
+        ],
+      ],
+      'nested_group' => [
+        '#type' => 'details',
+        '#title' => $this->t('Nested group'),
+        '#open' => TRUE,
+      ],
+      'checkbox_in_nested' => [
+        '#type' => 'checkbox',
+        '#group' => 'nested_group',
+        '#title' => $this->t('AJAX checkbox in a nested group'),
+        '#ajax' => [
+          'callback' => [$object, 'checkboxGroupCallback'],
+          'wrapper' => 'checkbox-wrapper',
+        ],
+      ],
+    ];
+
+    $form['another_checkbox_in_nested'] = [
+      '#type' => 'checkbox',
+      '#group' => 'nested_group',
+      '#title' => $this->t('Another AJAX checkbox in a nested group'),
+    ];
+
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+  }
+
+}