<?php

use Behat\Mink\Mink,
    Behat\Mink\Session,
    Behat\Mink\Driver\GoutteDriver,
    Behat\Mink\Driver\Goutte\Client as GoutteClient;

$startUrl = 'https://example.com';

// init Mink and register sessions
$mink = new Mink(array(
    'goutte1' => new Session(new GoutteDriver(new GoutteClient())),
    'goutte2' => new Session(new GoutteDriver(new GoutteClient())),
    'custom'  => new Session(new MyCustomDriver($startUrl))
));

// set the default session name
$mink->setDefaultSessionName('goutte2');

// visit a page
$mink->getSession()->visit($startUrl);

// call to getSession() without argument will always return a default session if has one (goutte2 here)
$mink->getSession()->getPage()->findLink('Downloads')->click();
echo $mink->getSession()->getPage()->getContent();

// call to getSession() with argument will return session by its name
$mink->getSession('custom')->getPage()->findLink('Downloads')->click();
echo $mink->getSession('custom')->getPage()->getContent();

// this all is done to make possible mixing sessions
$mink->getSession('goutte1')->getPage()->findLink('Chat')->click();
$mink->getSession('goutte2')->getPage()->findLink('Chat')->click();