Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDisplay\vendor\pvc\html\tests\unit_tests\attribute\AttributeVoidTest.php:16 Stack trace: #0 {main} thrown in I:\www\pvcDisplay\vendor\pvc\html\tests\unit_tests\attribute\AttributeVoidTest.php on line 16