Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\medivault\vendor\kornrunner\keccak\test\KeccakTest.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\medivault\vendor\kornrunner\keccak\test\KeccakTest.php on line 11