Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in E:\xampp\htdocs\www\key\vendor\phar-io\manifest\tests\xml\ContainsElementTest.php:8 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\key\vendor\phar-io\manifest\tests\xml\ContainsElementTest.php on line 8