@Test public void dontCrossEtheneDoubleBond() {

    IAtomContainer m = new AtomContainer();
    m.addAtom(atom("C", 2, 0.000, 0.000));
    m.addAtom(atom("C", 2, 1.299, -0.750));
    m.addBond(0, 1, IBond.Order.DOUBLE);
    NonplanarBonds.assign(m);
    assertThat(m.getBond(0).getStereo(), is(IBond.Stereo.NONE));
}