Fatal error: Uncaught Error: Class "Drupal\Tests\image\FunctionalJavascript\ImageFieldTestBase" not found in /home/www/drupal8/test/core/modules/image/tests/src/FunctionalJavascript/ImageFieldValidateTest.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/image/tests/src/FunctionalJavascript/ImageFieldValidateTest.php on line 13