Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\com.arbokcorp.app\vendor\phar-io\manifest\tests\xml\ContainsElementTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\com.arbokcorp.app\vendor\phar-io\manifest\tests\xml\ContainsElementTest.php on line 8