@Test
public void sodium_hydride() {

    IAtomContainer container = new AtomContainer();
    IAtom atom = new Atom("Na");
    atom.setValency(1);
    container.addAtom(atom);
    MDLValence.apply(container);
    assertThat(atom.getValency(), is(1));
    assertThat(atom.getImplicitHydrogenCount(), is(1));
}