Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp\htdocs\psp\backend\vendor\lcobucci\jwt\test\unit\Signer\BaseSignerTest.php:16 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\lcobucci\jwt\test\unit\Signer\BaseSignerTest.php on line 16