Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\vendor\psy\psysh\test\Formatter\SignatureFormatterTest.php:18 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\psy\psysh\test\Formatter\SignatureFormatterTest.php on line 18