public function testListMailingListsReturnsCorrectData()
 {
     $this->setMockResponse($this->client, array('mailing-lists/listMailingLists'));
     $mailingLists = $this->client->getMailingLists();
     $this->assertInstanceOf('\\Mgrt\\Model\\ResultCollection', $mailingLists);
     $this->assertEquals($mailingLists->count(), 2);
     foreach ($mailingLists as $mailingList) {
         $this->assertInstanceOf('\\Mgrt\\Model\\MailingList', $mailingList);
     }
 }