public void TriangleArea_ValidArguments_ReturnsResult(int sideA, int sideB, int sideC, double result)
{
Math.Round(TriangleHelpers.Area(sideA, sideB, sideC), DecimalNumbers).ShouldBeInRange(result - Delta, result + Delta);
}
public void TriangleArea_InvalidArguments_ThrowsException(int sideA, int sideB, int sideC)
{
ShouldThrowExtensions.ShouldThrow <InvalidTriangleException>(() => TriangleHelpers.Area(sideA, sideB, sideC));
}