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diff --git a/web/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php b/web/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php
new file mode 100644
index 000000000..1425588fc
--- /dev/null
+++ b/web/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace Drupal\entity_test\Plugin\Field\FieldType;
+
+use Drupal\Core\Field\Plugin\Field\FieldType\ChangedItem;
+
+/**
+ * Defines the 'changed_test' entity field type.
+ *
+ * Wraps Drupal\Core\Field\Plugin\Field\FieldType\ChangedItem.
+ *
+ * @FieldType(
+ *   id = "changed_test",
+ *   label = @Translation("Last changed"),
+ *   description = @Translation("An entity field containing a UNIX timestamp of when the entity has been last updated."),
+ *   no_ui = TRUE,
+ *   list_class = "\Drupal\Core\Field\ChangedFieldItemList"
+ * )
+ *
+ * @see \Drupal\Core\Entity\EntityChangedInterface
+ */
+class ChangedTestItem extends ChangedItem {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preSave() {
+    parent::preSave();
+
+    if ($this->value == REQUEST_TIME) {
+      // During a test the request time is immutable. To allow tests of the
+      // algorithm of
+      // Drupal\Core\Field\Plugin\Field\FieldType\ChangedItem::preSave() we need
+      // to set a real time value here.
+      $this->value = time();
+    }
+  }
+
+}