Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\hoteline\vendor\symfony\console\Tests\Completion\Output\CompletionOutputTestCase.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hoteline\vendor\symfony\console\Tests\Completion\Output\CompletionOutputTestCase.php on line 20