@Test public void markBut2eneWithWavyBond() {

    IAtomContainer m = new AtomContainer();
    m.addAtom(atom("C", 3, 0.000, 0.000));
    m.addAtom(atom("C", 1, 1.299, -0.750));
    m.addAtom(atom("C", 1, 2.598, -0.000));
    m.addAtom(atom("C", 3, 3.897, -0.750));
    m.addBond(0, 1, IBond.Order.SINGLE);
    m.addBond(1, 2, IBond.Order.DOUBLE);
    m.addBond(2, 3, IBond.Order.SINGLE);
    NonplanarBonds.assign(m);
    assertThat(m.getBond(0).getStereo(), is(IBond.Stereo.UP_OR_DOWN));
}