public void GetCampaignsCampaignIdStatsTest()
        {
            // TODO: add unit test for the method 'GetCampaignsCampaignIdStats'
            string campaignId = null; // TODO: replace null with proper value
            var    response   = instance.GetCampaignsCampaignIdStats(campaignId);

            Assert.IsInstanceOf <CampaignStats> (response, "response is CampaignStats");
        }