Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10csm\vendor\nesbot\carbon\tests\Laravel\ServiceProviderTest.php:30 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10csm\vendor\nesbot\carbon\tests\Laravel\ServiceProviderTest.php on line 30