public void GetDenominationsTestWithSomeInvalidBills()
        {
            AtmMachine machine = GetTestAtmMachine();

            var result = AtmMachineManagerHelper.GetDenominations("I $50 $37 $100", machine);

            Assert.IsTrue(result.Count() == 2);
        }
        public void IsValidCommandTestWithInvalidCommand()
        {
            var    input = "K";
            string command;

            bool result = AtmMachineManagerHelper.IsValidCommand(input, out command);

            Assert.IsFalse(result);
        }