public void Requirement3_InvalidInputsThrowSpecificException(int sideA, int sideB, int sideC)
 {
     Assert.Throws <InvalidTriangleException>(() => Requirement.GetArea(sideA, sideB, sideC));
 }
 public void Requirement3_ValidTriangleInputsReturnValidArea(double expectedArea, double sideA, double sideB, double sideC)
 {
     Assert.AreEqual(expectedArea, Requirement.GetArea(sideA, sideB, sideC));
 }