public void GetTemperature_GetTemperatureUsingMachineId_ReturnTrue() { Machine machine = new Machine() { MachineId = "IDX147", MachineName = "Machine147" }; MachineManager machineMgr = new MachineManager(); machineMgr.CreateMachine(machine: machine); machineMgr.SetTemperature(120, machine.MachineId); int?temp = machineMgr.GetTemperature(machine.MachineId); Assert.IsTrue(temp != null && temp == 120); }