Fatal error: Uncaught Error: Class "Drupal\Tests\contact\Functional\Rest\ContactFormResourceTestBase" not found in /home/www/drupal8/test/core/modules/contact/tests/src/Functional/Rest/ContactFormXmlBasicAuthTest.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/contact/tests/src/Functional/Rest/ContactFormXmlBasicAuthTest.php on line 11