public async Task CarrierInfo() { try { var carrierInfo = await Service.GetCarrierInfoAsync(); var forwardingInfo = await Service.GetForwardingInstructionsAsync(); Assert.IsTrue(carrierInfo.Id != 0); Assert.IsTrue(carrierInfo.Id == forwardingInfo.CarrierId); var carriers = await Service.GetSupportedCarriersAsync(); // Pick a new random carrier var rand = new Random(); var prefCarriers = new List <YouMailCarrier>(); foreach (var carrier in carriers.Carriers) { if (carrier.CarrierClass == 1) { prefCarriers.Add(carrier); } } YouMailCarrier newCarrier = null; do { newCarrier = prefCarriers[rand.Next(prefCarriers.Count)]; } // Don't choose AT&T as the name is not proper XML while (!newCarrier.SupportedFlag || newCarrier.Id == carrierInfo.Id || newCarrier.Id == 1); await Service.SetCarrierInfoAsync(newCarrier.Id); var changedCarrier = await Service.GetCarrierInfoAsync(); var changedForward = await Service.GetForwardingInstructionsAsync(); Assert.IsTrue(changedCarrier.Id == newCarrier.Id); Assert.IsTrue(changedForward.CarrierId == newCarrier.Id); await Service.SetCarrierInfoAsync(carrierInfo.Id); } catch (YouMailException yme) { Assert.Fail(yme.Message); } }