Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\sites\wasalnah.sabti-h.com\vendor\myclabs\deep-copy\tests\DeepCopyTest\Filter\SetNullFilterTest.php:12 Stack trace: #0 {main} thrown in C:\sites\wasalnah.sabti-h.com\vendor\myclabs\deep-copy\tests\DeepCopyTest\Filter\SetNullFilterTest.php on line 12