app/routes.php

Route::get('/user', function()
{
    $user = new User;
    $user->user_username                = 'Fredrik';
    $user->user_email               = 'xxxx@xxxx.se';
    $user->user_password                = 'testtest';
    $user->user_password_confirmation   = 'testtest';
    var_dump($user->save());
});