Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/app/code/Packetery/Checkout/Test/BaseTest.php:9 Stack trace: #0 /var/www/html/app/code/Packetery/Checkout/Test/bootstrap.php(6): require_once() #1 {main} thrown in /var/www/html/app/code/Packetery/Checkout/Test/BaseTest.php on line 9