Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/message_gateway/vendor/psy/psysh/test/Util/StrTest.php:16 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/psy/psysh/test/Util/StrTest.php on line 16