public void CalculateSum_Should_Return_Sum_of_Numbers_In_String()
{
string numbers = "1;2%3";
char[] delimiterArray = new char[] { ';', '%' };
int sum = sumCalculator.CalculateSum(numbers, delimiterArray);
Assert.AreEqual(6, sum);
}
static void Main(string[] args)
{
// create an object and upcast it to the combined interface
ICombinedCalculator calc = new Calculator();
// upcast to the base interfaces and call the method that each defines
IProductCalculator prodCalc = calc;
int prodResult = prodCalc.CalculateProduct(10, 10);
ISumCalculator sumCalc = calc;
int calcResult = sumCalc.CalculateSum(10, 10);
ISubtractionCalculator subCalc = calc;
int subResult = subCalc.CalculateSubtraction(10, 2);
// explicitly cast from one base interface to another
prodCalc = (IProductCalculator)subCalc;
// wait for input before exiting
Console.WriteLine("Press enter to finish");
Console.ReadLine();
}