public function testListCampaignsReturnsCorrectData()
 {
     $this->setMockResponse($this->client, array('campaigns/listCampaigns'));
     $campaigns = $this->client->getCampaigns();
     $this->assertInstanceOf('\\Mgrt\\Model\\ResultCollection', $campaigns);
     $this->assertEquals($campaigns->count(), 2);
     foreach ($campaigns as $campaign) {
         $this->assertInstanceOf('\\Mgrt\\Model\\Campaign', $campaign);
     }
 }