Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp\htdocs\psp\backend\vendor\lcobucci\jwt\test\unit\SignatureTest.php:14 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\lcobucci\jwt\test\unit\SignatureTest.php on line 14