--- /dev/null
+<?php
+
+namespace Drupal\Tests\menu_link_content\Functional\Update;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+use Drupal\user\Entity\User;
+
+/**
+ * Tests the upgrade path for custom menu links.
+ *
+ * @group menu_link_content
+ * @group Update
+ * @group legacy
+ */
+class MenuLinkContentUpdateTest extends UpdatePathTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../../system/tests/fixtures/update/drupal-8.filled.standard.php.gz',
+ ];
+ }
+
+ /**
+ * Tests the addition of the publishing status entity key.
+ *
+ * @see menu_link_content_update_8601()
+ */
+ public function testPublishedEntityKeyAddition() {
+ $this->runUpdates();
+
+ // Log in as user 1.
+ $account = User::load(1);
+ $account->passRaw = 'drupal';
+ $this->drupalLogin($account);
+
+ // Make sure our custom menu link exists.
+ $assert_session = $this->assertSession();
+ $this->drupalGet('admin/structure/menu/item/1/edit');
+ $assert_session->checkboxChecked('edit-enabled-value');
+
+ // Check that custom menu links can be created, saved and then loaded.
+ $storage = \Drupal::entityTypeManager()->getStorage('menu_link_content');
+ /** @var \Drupal\menu_link_content\Entity\MenuLinkContent $menu_link */
+ $menu_link = $storage->create([
+ 'menu_name' => 'main',
+ 'link' => 'route:user.page',
+ 'title' => 'Pineapple',
+ ]);
+ $menu_link->save();
+
+ $menu_link = $storage->loadUnchanged($menu_link->id());
+
+ $this->assertEquals('main', $menu_link->getMenuName());
+ $this->assertEquals('Pineapple', $menu_link->label());
+ $this->assertEquals('route:user.page', $menu_link->link->uri);
+ $this->assertTrue($menu_link->isPublished());
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function replaceUser1() {
+ // Do not replace the user from our dump.
+ }
+
+}