public void SurFace_CalculateRadius_ReturnSurfaceOfSphere()
        {
            SurfAndVol getSurf = new SurfAndVol();

            var result = getSurf.CalcSurface(1);

            Assert.That(result, Is.EqualTo(12.7));
        }
        public void Volume_CalculateRadius_returnVolumeOfSphere()
        {
            SurfAndVol getVol = new SurfAndVol();

            var result = getVol.CalcVolume(2);

            Assert.That(result, Is.EqualTo(33.51));
        }