Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\vendor\symfony\http-foundation\Tests\Session\Storage\MockArraySessionStorageTest.php:24 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\symfony\http-foundation\Tests\Session\Storage\MockArraySessionStorageTest.php on line 24