Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\AppServ\www\greenhess-storage\vendor\symfony\validator\Tests\Mapping\MemberMetadataTest.php:21 Stack trace: #0 {main} thrown in C:\AppServ\www\greenhess-storage\vendor\symfony\validator\Tests\Mapping\MemberMetadataTest.php on line 21