@Test
public void testBuckyballEssentialRings() throws Exception {

    IAtomContainer buckyball = createBuckyBall();
    IRingSet ringSetEssential = new SSSRFinder(buckyball).findEssentialRings();
    ringCount(ringSetEssential, 6, 0);
    ringCount(ringSetEssential, 5, 12);
    Assert.assertFalse("Duplicate rings exist", checkForDuplicateRingsInSet(ringSetEssential));
}