public function __construct(StoryTeller $st, $params = array())
{
// call our parent
parent::__construct($st, $params);
// get the SauceLabs auth details
// they are part of the test device details available from $st
$deviceDetails = $st->getDeviceDetails();
// remember the auth details
$this->sauceLabsUsername = $deviceDetails->saucelabs->username;
$this->sauceLabsAccessKey = $deviceDetails->saucelabs->accesskey;
}