@Test
public void dihydroazine() throws Exception {

    SmilesParser smipar = new SmilesParser(SilentChemObjectBuilder.getInstance());
    IAtomContainer mol = smipar.parseSmiles("N=N.N=N");
    layout(mol);
    assertThat(mol.getAtom(2).getPoint2d().x - mol.getAtom(1).getPoint2d().x,
               is(greaterThan(SDG.getBondLength())));
}