Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDisplay\vendor\pvc\struct\tests\unit_tests\collection\CollectionAbstractTest.php:20 Stack trace: #0 {main} thrown in I:\www\pvcDisplay\vendor\pvc\struct\tests\unit_tests\collection\CollectionAbstractTest.php on line 20