Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print\vendor\symfony\http-kernel\Tests\CacheClearer\Psr6CacheClearerTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print\vendor\symfony\http-kernel\Tests\CacheClearer\Psr6CacheClearerTest.php on line 18