@Test
public void surfaceToVolumeRatio() throws Exception {

   Assert.assertEquals(
          (3 * Math.sqrt(25 + 10 * Math.sqrt(5)) * Math.pow(edge, 2)) 
                 / (((15 + 7 * Math.sqrt(5)) / (4)) * Math.pow(edge, 3)),
           d.surfaceToVolumeRatio(), .001
   );
}