Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\hoteline\vendor\symfony\error-handler\Tests\Exception\FlattenExceptionTest.php:33 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hoteline\vendor\symfony\error-handler\Tests\Exception\FlattenExceptionTest.php on line 33