Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print\vendor\phar-io\manifest\tests\values\ExtensionTest.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print\vendor\phar-io\manifest\tests\values\ExtensionTest.php on line 26