Fatal error: Uncaught Error: Class "Drupal\Tests\rest\Functional\ResourceTestBase" not found in /home/www/drupal8/test/core/modules/dblog/tests/src/Functional/DbLogResourceTest.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/dblog/tests/src/Functional/DbLogResourceTest.php on line 15