Fatal error: Uncaught Error: Class "Drupal\views\Tests\ViewTestBase" not found in /home/www/drupal8/test/core/modules/views/src/Tests/Plugin/PluginTestBase.php:13
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/views/src/Tests/Plugin/PluginTestBase.php on line 13