@Test
public void molecularHydrogenDoesNotBreakAssignment() {

    IAtomContainer container = new AtomContainer(2, 1, 0, 0);
    container.addAtom(atom("H", 0));
    container.addAtom(atom("H", 0));
    container.addBond(0, 1, SINGLE);
    String[] expected = {null, null};
    String[] actual = INSTANCE.symbolicTypes(container);
    Assert.assertArrayEquals(expected, actual);
}