Fatal error: Uncaught Error: Class "Drupal\Tests\views_ui\Functional\UITestBase" not found in /home/www/drupal8/test/core/modules/taxonomy/tests/src/Functional/Views/TaxonomyParentUITest.php:14
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/taxonomy/tests/src/Functional/Views/TaxonomyParentUITest.php on line 14