public void GetTotal_GetTotalUsingMachineId_ReturnTrue()
{
Machine machine = new Machine()
{
MachineId = "IDX147",
MachineName = "Machine147"
};
MachineManager machineMgr = new MachineManager();
machineMgr.CreateMachine(machine: machine);
machineMgr.AddUnits(120, machine.MachineId);
int?total = machineMgr.GetTotal(machine.MachineId);
Assert.IsTrue(total != null && total == 120);
}
