Fatal error: Uncaught Error: Call to undefined function test() in C:\xampp\htdocs\r10ca\vendor\laravel\serializable-closure\tests\SignedSerializerTest.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\laravel\serializable-closure\tests\SignedSerializerTest.php on line 6