@Test(expected = IllegalArgumentException.class)
public void aromaticCompoundsAreRejected() {

    IAtomContainer container = new AtomContainer();
    container.addAtom(new Atom("C"));
    container.getAtom(0).setImplicitHydrogenCount(4);
    container.getAtom(0).setFlag(CDKConstants.ISAROMATIC, true);
    INSTANCE.symbolicTypes(container);
}