package controller - variable injection

controller.php

<?php
namespace Concrete\Package\Test;

use Package,
    Page,
    Events,
    View,
    Symfony\Component\EventDispatcher\GenericEvent;

class Controller extends Package
{
    protected $pkgHandle = 'test';
    protected $appVersionRequired = '5.7.5';
    protected $pkgVersion = '0.9.1';

    public function getPackageName()
    {
        return t('Test');
    }

    public function getPackageDescription()
    {
        return t('Test');
    }

    public function on_start()
    {
        Events::addListener(
            'on_before_render', function (GenericEvent $e) {
                $view = $e->getArgument('view');
                $view->controller->set('foo', 'bar');
            }
        );
    }
}