public bool SetAndGetShouldGiveSameResult(int amount)
        {
            var dollar = Dollar.Create(0);

            dollar.Add(amount);

            return(dollar.Amount == amount);
        }
        public bool AddThenMultiplierSameAsCreate(int start, int times)
        {
            var dollar = Dollar.Create(0);

            dollar.Add(start);
            dollar.Multiplier(times);

            var dollar2 = Dollar.Create(start * times);

            return(dollar.Amount == dollar2.Amount);
        }