Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\nesbot\carbon\tests\Core\Fixer\GenerateDiffTest.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\nesbot\carbon\tests\Core\Fixer\GenerateDiffTest.php on line 26