Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\laravel-back\vendor\lcobucci\jwt\test\functional\UnsignedTokenTest.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\laravel-back\vendor\lcobucci\jwt\test\functional\UnsignedTokenTest.php on line 19