Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\www\key1\vendor\sebastian\global-state\tests\RestorerTest.php:20 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\key1\vendor\sebastian\global-state\tests\RestorerTest.php on line 20