Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home2/santhos2/public_html/kannan.firstmatrix.in.net/core/vendor/mercadopago/dx-php/tests/resources/PaymentTest.php:10 Stack trace: #0 {main} thrown in /home2/santhos2/public_html/kannan.firstmatrix.in.net/core/vendor/mercadopago/dx-php/tests/resources/PaymentTest.php on line 10