public void ShouldFailAlphaNumeric()
 {
     Assert.Throws <ArgumentException>(delegate { CalculateAreaOfCircle.AreaOfCircle("number"); });
 }
 public void ShouldPass1()
 {
     Assert.AreEqual(5881.25, CalculateAreaOfCircle.AreaOfCircle("43.2673"));
 }
 public void ShouldFailNegativeNumber()
 {
     Assert.Throws <ArgumentException>(delegate { CalculateAreaOfCircle.AreaOfCircle("-123"); });
     //Assert.Throws(typeof(ArgumentException), Kata.CalculateAreaOfCircle("-123"));
 }