Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDom\vendor\pvc\struct\examples\tests\TreenodeFactoryUnorderedTest.php:13 Stack trace: #0 {main} thrown in I:\www\pvcDom\vendor\pvc\struct\examples\tests\TreenodeFactoryUnorderedTest.php on line 13