Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/atk4/core/src/Phpunit/TestCase.php:19 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/atk4/core/src/Phpunit/TestCase.php on line 19