Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/usonboard.com/vendor/paragonie/constant_time_encoding/tests/RFC4648Test.php:16 Stack trace: #0 {main} thrown in /var/www/usonboard.com/vendor/paragonie/constant_time_encoding/tests/RFC4648Test.php on line 16