app.php

<?php

require_once __DIR__.'/bootstrap.php';

$app->get('/', function() use($app) {
    return $app['twig']->render('index.html.twig');
});

$app->mount('/test', new \Testapp\Controller\Test());

Test.php

<?php
namespace Testapp\Controller;

use Silex\Application;
use Silex\ControllerProviderInterface;
use Silex\ControllerCollection;

use Testapp\Form;

class Test implements ControllerProviderInterface 
{
    public function connect(Application $app) {

        $db = $app['db'];
        $controllers = new ControllerCollection();


        $controllers->get('/', function() use($db) {
            $collection = $db->local;
            var_dump($collection);
            $c = $collection->find();
            
            while($c->hasNext()) {
                var_dump($c->getNext());
            }
        });


        $controllers->get('/create', function() use($app, $db) {
            $form = $app['form.factory']->create(new Form\Test());

            return $app['twig']->render('test/create.html.twig', array(
                'form' => $form->createView(),
            ));
        });

        return $controllers;
    }
}