Fatal error: Uncaught Error: Class "Drupal\Tests\block_content\Functional\Rest\BlockContentResourceTestBase" not found in /home/www/drupal8/test/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/rest/tests/src/Functional/EntityResource/BlockContent/BlockContentResourceTestBase.php on line 15