Fatal error: Uncaught Error: Class "Drupal\FunctionalTests\Rest\DateFormatResourceTestBase" not found in /home/www/drupal8/test/core/tests/Drupal/FunctionalTests/Rest/DateFormatJsonAnonTest.php:10
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/tests/Drupal/FunctionalTests/Rest/DateFormatJsonAnonTest.php on line 10