Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/appgulf1/elevator.hifisys.com/elevator/vendor/myclabs/deep-copy/tests/DeepCopyTest/DeepCopyTest.php:44 Stack trace: #0 {main} thrown in /home/appgulf1/elevator.hifisys.com/elevator/vendor/myclabs/deep-copy/tests/DeepCopyTest/DeepCopyTest.php on line 44