public void add_test()
{
const int a = 1;
const int b = 2;
var adder = new Adder();
var c = adder.Add(a, b);
Assert.AreEqual(3, c);
}
static void Main(string[] args)
{
Console.Write("Enter your first number: ");
var firstNum = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter your second number: ");
var secondNum = Convert.ToInt32(Console.ReadLine());
var adder = new Adder();
Console.WriteLine("Your two numbers add up to: " + adder.Add(firstNum, secondNum));
Console.ReadLine();
}