Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\portal\vendor\mercadopago\dx-php\tests\resources\PreferenceTest.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\portal\vendor\mercadopago\dx-php\tests\resources\PreferenceTest.php on line 7