Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\notificacion\vendor\symfony\service-contracts\Test\ServiceLocatorTestCase.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\notificacion\vendor\symfony\service-contracts\Test\ServiceLocatorTestCase.php on line 18