Fatal error: Uncaught Error: Class "Drupal\Tests\views\Kernel\ViewsKernelTestBase" not found in /home/www/drupal8/test/core/modules/aggregator/tests/src/Kernel/Views/IntegrationTest.php:17 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/aggregator/tests/src/Kernel/Views/IntegrationTest.php on line 17