public function testListSendersReturnsCorrectData()
 {
     $this->setMockResponse($this->client, array('senders/listSenders'));
     $senders = $this->client->getSenders();
     $this->assertInstanceOf('\\Mgrt\\Model\\ResultCollection', $senders);
     $this->assertEquals($senders->count(), 2);
     foreach ($senders as $sender) {
         $this->assertInstanceOf('\\Mgrt\\Model\\Sender', $sender);
     }
 }