@Test
public void testCompare_Identity() throws Exception {

    IAtomContainer molecule = smiles.parseSmiles("CC(Br)([13C])[H]");
    ILigand ligand = new Ligand(molecule, new VisitedAtoms(), molecule.getAtom(1), molecule.getAtom(0));
    ISequenceSubRule<ILigand> rule = new CIPLigandRule();
    Assert.assertEquals(0, rule.compare(ligand, ligand));
}