public void RedditTestCase2()
        {
            const int x = 4;
            const int y = 2;

            int output = PascalTriangleCalculator.GetValueFromCoOrdinates(x, y);

            Assert.AreEqual(3, output);
        }
 public void CanHandleInvalidInput()
 {
     Assert.Throws <ArgumentOutOfRangeException>(() => PascalTriangleCalculator.GetValueFromCoOrdinates(1, 19));
 }