Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\api\vendor\firebase\php-jwt\tests\CachedKeySetTest.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\api\vendor\firebase\php-jwt\tests\CachedKeySetTest.php on line 16