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

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