Fatal error: Uncaught Error: Class "Drupal\views\Tests\ViewTestBase" not found in /home/www/drupal8/test/core/modules/block_content/src/Tests/Views/BlockContentTestBase.php:19 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/block_content/src/Tests/Views/BlockContentTestBase.php on line 19