--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Functional\Update;
+
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests system_update_8001().
+ *
+ * @group Update
+ */
+class MenuTreeSerializationTitleTest extends UpdatePathTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../tests/fixtures/update/drupal-8.bare.standard.php.gz',
+ ];
+ }
+
+ /**
+ * Ensures that the system_update_8001() runs as expected.
+ */
+ public function testUpdate() {
+ $this->runUpdates();
+
+ // Ensure that some fields got dropped.
+ $database = \Drupal::database();
+ $schema = $database->schema();
+
+ if (!$schema->tableExists('menu_tree')) {
+ return;
+ }
+
+ $this->assertFalse($schema->fieldExists('menu_tree', 'title_arguments'));
+ $this->assertFalse($schema->fieldExists('menu_tree', 'title_contexts'));
+
+ // Ensure that all titles and description values can be unserialized.
+ $select = $database->select('menu_tree');
+ $result = $select->fields('menu_tree', ['id', 'title', 'description'])
+ ->execute()
+ ->fetchAllAssoc('id');
+
+ // The test coverage relies upon the fact that unserialize() would emit a
+ // warning if the value is not a valid serialized value.
+ foreach ($result as $link) {
+ $title = unserialize($link->title);
+ $description = unserialize($link->description);
+ // Verify that all the links from system module have a been updated with
+ // a TranslatableMarkup as title and description due to the rebuild.
+ if (strpos($link->id, 'system.') === 0) {
+ $this->assertTrue($title instanceof TranslatableMarkup, get_class($title));
+ if ($description) {
+ $this->assertTrue($description instanceof TranslatableMarkup, get_class($description));
+ }
+ }
+ }
+ }
+
+}