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diff --git a/web/core/modules/field/tests/modules/field_test/src/Form/NestedEntityTestForm.php b/web/core/modules/field/tests/modules/field_test/src/Form/NestedEntityTestForm.php
new file mode 100644
index 000000000..949ffda66
--- /dev/null
+++ b/web/core/modules/field/tests/modules/field_test/src/Form/NestedEntityTestForm.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace Drupal\field_test\Form;
+
+use Drupal\Core\Entity\EntityChangedInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Entity\Entity\EntityFormDisplay;
+
+/**
+ * Provides a form for field_test routes.
+ */
+class NestedEntityTestForm extends FormBase {
+
+  /**
+   * {@inheritdoc]
+   */
+  public function getFormId() {
+    return 'field_test_entity_nested_form';
+  }
+
+  /**
+   * {@inheritdoc]
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, EntityInterface $entity_1 = NULL, EntityInterface $entity_2 = NULL) {
+    // First entity.
+    $form_state->set('entity_1', $entity_1);
+    $form_display_1 = EntityFormDisplay::collectRenderDisplay($entity_1, 'default');
+    $form_state->set('form_display_1', $form_display_1);
+    $form_display_1->buildForm($entity_1, $form, $form_state);
+
+    // Second entity.
+    $form_state->set('entity_2', $entity_2);
+    $form_display_2 = EntityFormDisplay::collectRenderDisplay($entity_2, 'default');
+    $form_state->set('form_display_2', $form_display_2);
+    $form['entity_2'] = [
+      '#type' => 'details',
+      '#title' => t('Second entity'),
+      '#tree' => TRUE,
+      '#parents' => ['entity_2'],
+      '#weight' => 50,
+      '#attributes' => ['class' => ['entity-2']]
+    ];
+
+    $form_display_2->buildForm($entity_2, $form['entity_2'], $form_state);
+
+    if ($entity_2 instanceof EntityChangedInterface) {
+      // Changed must be sent to the client, for later overwrite error checking.
+      // @see Drupal\field\Tests\NestedFormTest::testNestedEntityFormEntityLevelValidation()
+      $form['entity_2']['changed'] = [
+        '#type' => 'hidden',
+        '#default_value' => $entity_1->getChangedTime(),
+      ];
+    }
+
+    $form['save'] = [
+      '#type' => 'submit',
+      '#value' => t('Save'),
+      '#weight' => 100,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc]
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    $entity_1 = $form_state->get('entity_1');
+    /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $form_display_1 */
+    $form_display_1 = $form_state->get('form_display_1');
+    $form_display_1->extractFormValues($entity_1, $form, $form_state);
+    $form_display_1->validateFormValues($entity_1, $form, $form_state);
+
+    $entity_2 = $form_state->get('entity_2');
+    /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $form_display_2 */
+    $form_display_2 = $form_state->get('form_display_2');
+    $extracted = $form_display_2->extractFormValues($entity_2, $form['entity_2'], $form_state);
+    // Extract the values of fields that are not rendered through widgets, by
+    // simply copying from top-level form values. This leaves the fields that
+    // are not being edited within this form untouched.
+    // @see Drupal\field\Tests\NestedFormTest::testNestedEntityFormEntityLevelValidation()
+    foreach ($form_state->getValues()['entity_2'] as $name => $values) {
+      if ($entity_2->hasField($name) && !isset($extracted[$name])) {
+        $entity_2->set($name, $values);
+      }
+    }
+    $form_display_2->validateFormValues($entity_2, $form['entity_2'], $form_state);
+  }
+
+  /**
+   * {@inheritdoc]
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    /** @var \Drupal\Core\Entity\EntityInterface $entity_1 */
+    $entity_1 = $form_state->get('entity_1');
+    $entity_1->save();
+
+    /** @var \Drupal\Core\Entity\EntityInterface $entity_2 */
+    $entity_2 = $form_state->get('entity_2');
+    $entity_2->save();
+
+    drupal_set_message($this->t('test_entities @id_1 and @id_2 have been updated.', ['@id_1' => $entity_1->id(), '@id_2' => $entity_2->id()]));
+  }
+
+}