Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/guox/public_html/Chxcras/vendor/mercadopago/dx-php/tests/MercadoPago/MercadoPagoConfigTest.php:9 Stack trace: #0 {main} thrown in /home/guox/public_html/Chxcras/vendor/mercadopago/dx-php/tests/MercadoPago/MercadoPagoConfigTest.php on line 9