Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcFrmtr\vendor\pvc\struct\tests\unit_tests\collection\ArrayIteratorNonNegIntKeysTest.php:12 Stack trace: #0 {main} thrown in I:\www\pvcFrmtr\vendor\pvc\struct\tests\unit_tests\collection\ArrayIteratorNonNegIntKeysTest.php on line 12