Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\laravel-api-back01\vendor\lcobucci\jwt\test\unit\Signer\BaseSignerTest.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\laravel-api-back01\vendor\lcobucci\jwt\test\unit\Signer\BaseSignerTest.php on line 16