Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcFilterVar\vendor\pvc\testing-traits\tests\testingTraits\PrivateMethodTestingTraitTest.php:13 Stack trace: #0 {main} thrown in I:\www\pvcFilterVar\vendor\pvc\testing-traits\tests\testingTraits\PrivateMethodTestingTraitTest.php on line 13