Fatal error: Uncaught Error: Class "Drupal\Tests\system\Kernel\Token\TokenReplaceKernelTestBase" not found in /home/www/drupal8/test/core/modules/node/tests/src/Kernel/NodeTokenReplaceTest.php:18 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/node/tests/src/Kernel/NodeTokenReplaceTest.php on line 18