Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\api.blank_fe_delete\vendor\sebastian\diff\tests\DifferTest.php:27 Stack trace: #0 {main} thrown in E:\xampp\htdocs\api.blank_fe_delete\vendor\sebastian\diff\tests\DifferTest.php on line 27