@Test
public void testDeltaVSulphurSO2() {

    IAtom s = builder.newInstance(IAtom.class, "S");
    IAtom o1 = builder.newInstance(IAtom.class, "O");
    IAtom o2 = builder.newInstance(IAtom.class, "O");
    IBond b1 = builder.newInstance(IBond.class, s, o1);
    IBond b2 = builder.newInstance(IBond.class, s, o2);
    b1.setOrder(IBond.Order.DOUBLE);
    b2.setOrder(IBond.Order.DOUBLE);
    IAtomContainer m = builder.newInstance(IAtomContainer.class);
    m.addAtom(s);
    m.addAtom(o1);
    m.addBond(b1);
    m.addAtom(o2);
    m.addBond(b2);
    double deltav = ChiIndexUtils.deltavSulphur(s, m);
    Assert.assertEquals(2.67, deltav, 0.01);
}