/**
* Overload the constructor to set the User_agaent header
*
* @return void
* @author Alistair Stead
**/
public function __construct()
{
parent::__construct();
$this->setHeader('User-Agent', self::MAGE_TEST_USER_AGENT);
$this->setHeader('Accept', 'application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5');
}