Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\myclabs\deep-copy\tests\DeepCopyTest\DeepCopyTest.php:42 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\myclabs\deep-copy\tests\DeepCopyTest\DeepCopyTest.php on line 42