Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/pixel/public_html/vendor/quickpay/quickpay-php-client/Tests/api/ExceptionTest.php:8 Stack trace: #0 {main} thrown in /home/pixel/public_html/vendor/quickpay/quickpay-php-client/Tests/api/ExceptionTest.php on line 8