Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/appgulf1/elevator.hifisys.com/elevator/vendor/theseer/tokenizer/tests/Issue18Test.php:10 Stack trace: #0 {main} thrown in /home/appgulf1/elevator.hifisys.com/elevator/vendor/theseer/tokenizer/tests/Issue18Test.php on line 10