public void VariableRate(double salary, double amountDay, double rate, double res) { Parameter _salary = new Parameter(); Parameter _amountDay = new Parameter(); Parameter _rate = new Parameter(); _salary.Value = salary; _salary.Description = SalaryRateModel.Properties.Resources.Salary; _amountDay.Value = amountDay; _amountDay.Description = SalaryRateModel.Properties.Resources.DayAmount; _rate.Value = rate; _rate.Description = SalaryRateModel.Properties.Resources.Rate; VariableRate pay = new VariableRate(_salary, _amountDay, _rate); double result = pay.GetSummOfPay(); Assert.AreEqual(res, result); }