Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home2/waveflyf/webhook.waveflyff.com.br/vendor/mercadopago/dx-php/tests/MercadoPago/MercadoPagoConfigTest.php:9 Stack trace: #0 {main} thrown in /home2/waveflyf/webhook.waveflyff.com.br/vendor/mercadopago/dx-php/tests/MercadoPago/MercadoPagoConfigTest.php on line 9