Fatal error: Uncaught Error: Class 'Drupal\Tests\UnitTestCase' not found in /var/www/html/tmp/contrib/devel/devel_generate/tests/src/Unit/DevelGenerateManagerTest.php:13 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/devel/devel_generate/tests/src/Unit/DevelGenerateManagerTest.php on line 13