Fatal error: Uncaught Error: Class "Drupal\Tests\update\Functional\UpdateTestBase" not found in /home/www/drupal8/test/core/modules/update/tests/src/Functional/FileTransferAuthorizeFormTest.php:10 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/update/tests/src/Functional/FileTransferAuthorizeFormTest.php on line 10