public void CalculateRate()
{
FirstClass _firstClass = new FirstClass();
SecondClass _secondClass = new SecondClass();
ThirdClass _thirdClass = new ThirdClass();
FedEx _fedEx = new FedEx();
SPUFourD _fourD = new SPUFourD();
SPUTwoD _twoD = new SPUTwoD();
SPUNextD _nextD = new SPUNextD();
//first class
Assert.AreEqual(0.035, _firstClass.CalculateRate(1, 1), "Input: _firstClass.CalculateRate(1, 1)");
Assert.AreEqual(0.040, _firstClass.CalculateRate(1, 3), "Input: _firstClass.CalculateRate(1, 3)");
Assert.AreEqual(0.047, _firstClass.CalculateRate(1, 9), "Input: _firstClass.CalculateRate(1, 9)");
Assert.AreEqual(0.195, _firstClass.CalculateRate(1, 16), "Input: _firstClass.CalculateRate(1, 1)");
Assert.AreEqual(0.450, _firstClass.CalculateRate(1, 64), "Input: _firstClass.CalculateRate(1, 1)");
Assert.AreEqual(0.500, _firstClass.CalculateRate(1, 144), "Input: _firstClass.CalculateRate(1, 1)");
//second class
Assert.AreEqual(0.0035, _secondClass.CalculateRate(1, 1), "Input: _secondClass.CalculateRate(1, 1)");
Assert.AreEqual(0.0040, _secondClass.CalculateRate(1, 3), "Input: _secondClass.CalculateRate(1, 3)");
Assert.AreEqual(0.0047, _secondClass.CalculateRate(1, 9), "Input: _secondClass.CalculateRate(1, 9)");
Assert.AreEqual(0.0195, _secondClass.CalculateRate(1, 16), "Input: _secondClass.CalculateRate(1, 16)");
Assert.AreEqual(0.0450, _secondClass.CalculateRate(1, 64), "Input: _secondClass.CalculateRate(1, 64)");
Assert.AreEqual(0.0500, _secondClass.CalculateRate(1, 144), "Input: _secondClass.CalculateRate(1, 144)");
//third class
Assert.AreEqual(0.0020, _thirdClass.CalculateRate(1, 1), "Input: _thirdClass.CalculateRate(1, 1)");
Assert.AreEqual(0.0022, _thirdClass.CalculateRate(1, 3), "Input: _thirdClass.CalculateRate(1, 3)");
Assert.AreEqual(0.0024, _thirdClass.CalculateRate(1, 9), "Input: _thirdClass.CalculateRate(1, 9)");
Assert.AreEqual(0.0150, _thirdClass.CalculateRate(1, 16), "Input: _thirdClass.CalculateRate(1, 16)");
Assert.AreEqual(0.0160, _thirdClass.CalculateRate(1, 64), "Input: _thirdClass.CalculateRate(1, 64)");
Assert.AreEqual(0.0170, _thirdClass.CalculateRate(1, 144), "Input: _thirdClass.CalculateRate(1, 144)");
//fedex
Assert.AreEqual(20.00, _fedEx.CalculateRate(1, 16), "Input: _fedEx.CalculateRate(1, 16)");
Assert.AreEqual(23.00, _fedEx.CalculateRate(1, 64), "Input: _fedEx.CalculateRate(1, 64)");
Assert.AreEqual(25.00, _fedEx.CalculateRate(501, 16), "Input: _fedEx.CalculateRate(501, 16)");
Assert.AreEqual(28.00, _fedEx.CalculateRate(505, 50), "Input: _fedEx.CalculateRate(505, 50)");
//spu four day
Assert.AreEqual("$0.02", _fourD.CalculateRate(10, 5).ToString("c"), "Input: _fourD.CalculateRate(10, 5)");
Assert.AreEqual(.25, _fourD.CalculateRate(10, 80), "Input: _fourD.CalculateRate(10, 80)");
//spu two day
Assert.AreEqual("$0.16", _twoD.CalculateRate(10, 5).ToString("c"), "Input: _twoD.CalculateRate(10, 5)");
Assert.AreEqual(2.50, _twoD.CalculateRate(10, 80), "Input: _twoD.CalculateRate(10, 80)");
//spu next day
Assert.AreEqual("$0.23", _nextD.CalculateRate(10, 5).ToString("c"), "Input: _nextD.CalculateRate(10, 5)");
Assert.AreEqual(3.75, _nextD.CalculateRate(10, 80), "Input: _nextD.CalculateRate(10, 80)");
}