static void Main(string[] args)
 {
     Console.WriteLine("Please wait... This application is an annoyingly slow starter...");
     Thread.Sleep(5000);
     var radius = double.Parse(args[0]);
     var circleCalculater = new CircleCalculater();
     Console.WriteLine("Circle Area is: " + circleCalculater.CalculateArea(radius));
 }
 public void CalculateArea_RadiusOne_ReturnsPi()
 {
     var circleArea = new CircleCalculater().CalculateArea(1);
     Assert.AreEqual(Math.PI, circleArea);
 }