Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\frameworks\Laravel\vendor\psy\psysh\test\Formatter\SignatureFormatterTest.php:18 Stack trace: #0 {main} thrown in I:\www\frameworks\Laravel\vendor\psy\psysh\test\Formatter\SignatureFormatterTest.php on line 18