<?php

use Behat\Mink\Mink,
    Behat\Mink\Session,
    Behat\Mink\Driver\BrowserKitDriver;

use Symfony\Component\HttpKernel\Client;

$app  = require_once(__DIR__.'/app.php'); // Silex app

$mink = new Mink(array(
    'silex' => new Session(new BrowserKitDriver(new Client($app))),
));

$mink->getSession('silex')->getPage()->findLink('Chat')->click();