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