Kata number 2

Kata2.cs

namespace TDDKata2
{
    public class Class1
    {
        [Test]
        public void Volume_Of_A_Cube()
        {
            Assert.That(new Cube(1).Volume, Is.EqualTo(1));
        }

        [Test]
        public void Volume_of_a_Cylinder()
        {
            Assert.That(Cylinder.GetVolume(1, 1), Is.EqualTo(Math.PI));
            Assert.That(Cylinder.GetVolume(2, 1), Is.EqualTo(2 * Math.PI));
        }

        [Test]
        public void Volume_of_a_Pyramid()
        {
            Assert.That(Volume.Of(new Pyramid(1, 1)), Is.EqualTo(1.0/3));
        }
    }


    public static class Cylinder
    {
        public static double GetVolume(int height, int radius)
        {
            return Math.PI * radius * radius * height;
        }
    }

    public class Cube
    {
        private readonly int _width;

        public Cube(int width)
        {
            _width = width;
        }

        public double Volume => _width * _width * _width;
    }
}