Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\hoteline\vendor\symfony\http-foundation\Tests\Test\Constraint\ResponseHasHeaderTest.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hoteline\vendor\symfony\http-foundation\Tests\Test\Constraint\ResponseHasHeaderTest.php on line 20