Fatal error: Uncaught Error: Class "Drupal\Tests\views\Kernel\Plugin\StyleTestBase" not found in /home/www/drupal8/test/core/modules/views/tests/src/Kernel/Plugin/StyleUnformattedTest.php:12 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/views/tests/src/Kernel/Plugin/StyleUnformattedTest.php on line 12