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