Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\Landaweb\webs\server\vendor\mercadopago\dx-php\tests\EntityTest.php:8 Stack trace: #0 {main} thrown in C:\Landaweb\webs\server\vendor\mercadopago\dx-php\tests\EntityTest.php on line 8