Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\batuhansunar\vendor\rubix\ml\tests\Classifiers\OneVsRestTest.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\batuhansunar\vendor\rubix\ml\tests\Classifiers\OneVsRestTest.php on line 26