@Test
public void testNewAtomImplicitHydrogenCount() {

    Assert.assertNull(new Atom("C").getImplicitHydrogenCount());
    Assert.assertNull(new Atom("*").getImplicitHydrogenCount());
    Assert.assertNull(new Atom("H").getImplicitHydrogenCount());
    Assert.assertNull(new Atom("D").getImplicitHydrogenCount());
    Assert.assertNull(new Atom("T").getImplicitHydrogenCount());
}