public void SphereTests()
        {
            var sphere = new Sphere(new Meter(1));
            var volume = sphere.GetVolume<Meter>();
            Assert.AreEqual(4/3*Math.PI, volume.Value); // 4/3 * pi * r^2

            sphere.SetRadius(new Meter(5));
            Assert.AreEqual(4/3*Math.PI*Math.Pow(sphere.GetRadius<Meter>().Value,3), sphere.GetVolume<Meter>().Value);

            sphere.SetMass(new Kilogram(50));
            Assert.AreEqual(50000, sphere.GetMass<Gram>().Value);
        }
        public void SphereTests()
        {
            var sphere = new Sphere(new Meter(1));
            var volume = sphere.GetVolume <Meter>();

            Assert.AreEqual(4 / 3 * Math.PI, volume.Value); // 4/3 * pi * r^2

            sphere.SetRadius(new Meter(5));
            Assert.AreEqual(4 / 3 * Math.PI * Math.Pow(sphere.GetRadius <Meter>().Value, 3), sphere.GetVolume <Meter>().Value);

            sphere.SetMass(new Kilogram(50));
            Assert.AreEqual(50000, sphere.GetMass <Gram>().Value);
        }