Fatal error: Uncaught Error: Class "Drupal\KernelTests\KernelTestBase" not found in /home/www/drupal8/test/modules/token/tests/src/Kernel/KernelTestBase.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/modules/token/tests/src/Kernel/KernelTestBase.php on line 11