Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\kalimark\vendor\symfony\http-kernel\Tests\KernelTest.php:31 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kalimark\vendor\symfony\http-kernel\Tests\KernelTest.php on line 31