public void CalculateTheNetSalaryWhenFixedSalaryIsOverTheMinimumTax()
        {
            int      fixedSalary = 5000;
            Salesman salesman    = this.CreateSalesman(fixedSalary);

            Assert.AreEqual(4250, salesman.NetSalary());
        }
        public void CalculateTheNetSalaryWhenFixedSalaryIsUnderTheMinimumTax()
        {
            int      fixedSalary = 3000;
            Salesman salesman    = CreateSalesman(fixedSalary);

            Assert.AreEqual(2700, salesman.NetSalary());
        }
        public void CalculateTheNetSalaryWhenHaveMonthQuota()
        {
            int      fixedSalary = 3000;
            Salesman salesman    = this.CreateSalesman(fixedSalary);

            salesman.UpdateMonthQuota(1000);

            Assert.AreEqual(2800, salesman.NetSalary());
        }