/**
  * Returns the AddressGroupConsumer singleton instance.
  * 
  * @return \ZBateson\MailMimeParser\Header\Consumer\AddressGroupConsumer
  */
 public function getAddressGroupConsumer()
 {
     return AddressGroupConsumer::getInstance($this, $this->partFactory);
 }
 protected function setUp()
 {
     $pf = new HeaderPartFactory();
     $cs = new ConsumerService($pf);
     $this->addressGroupConsumer = AddressGroupConsumer::getInstance($cs, $pf);
 }