Fatal error: Uncaught Error: Class "Drupal\Tests\block\Functional\Rest\BlockResourceTestBase" not found in /home/www/drupal8/test/core/modules/block/tests/src/Functional/Rest/BlockJsonBasicAuthTest.php:10
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/block/tests/src/Functional/Rest/BlockJsonBasicAuthTest.php on line 10