Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\vendor\symfony\http-foundation\Tests\File\MimeType\MimeTypeTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\symfony\http-foundation\Tests\File\MimeType\MimeTypeTest.php on line 22