Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\symfony\var-dumper\Tests\Cloner\DataTest.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\symfony\var-dumper\Tests\Cloner\DataTest.php on line 20