Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/gmarket/public_html/vendor/mercadopago/dx-php/tests/MercadoPagoSdkTest.php:10 Stack trace: #0 {main} thrown in /home/gmarket/public_html/vendor/mercadopago/dx-php/tests/MercadoPagoSdkTest.php on line 10