Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\sftpScan\vendor\paragonie\constant_time_encoding\tests\RFC4648Test.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\sftpScan\vendor\paragonie\constant_time_encoding\tests\RFC4648Test.php on line 16