public async Task<GetSummaryPerformanceResponse> GetSummaryPerformance(int checkId, PerformanceArgs args = null)
        {

            var queryString = args != null ? args.ToQueryString() : string.Empty;
            var apiMethod = string.Format("summary.performance/{0}" + queryString.ToLower(), checkId);
            var response = await Client.GetAsync<GetSummaryPerformanceResponse>(apiMethod);

            return response;
        }
        public async Task GetSummaryPerformance_WithArgs()
        {
            var args = new PerformanceArgs
            {
                From = DateTime.Now.AddMonths(-3).ToUnixTimestamp(),
                Resolution = Resolution.Day,
                Order = Order.Asc
            };

            var summaryPerformanceResponse = await Pingdom.Client.Performance.GetSummaryPerformance(checkID, args);

            Assert.IsNotNull(summaryPerformanceResponse);
            Assert.IsFalse(summaryPerformanceResponse.HasErrors);
        }