@Test
public void azaniumAtom() {

    IAtom a = g2c.toCDKAtom(AtomBuilder.aliphatic(Element.Nitrogen).hydrogens(4).cation().build(), 4);
    assertThat(a.getSymbol(), is("N"));
    assertThat(a.getImplicitHydrogenCount(), is(4));
    assertThat(a.getFormalCharge(), is(+1));
}