Fatal error: Uncaught Error: Class "Drupal\Tests\taxonomy\Kernel\Views\TaxonomyTestBase" not found in /home/www/drupal8/test/core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyDefaultArgumentTest.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyDefaultArgumentTest.php on line 15