@Test
public void testSimpleNumbering() throws CDKException {

    IAtomContainer container = new AtomContainer();
    container.addAtom(new Atom("O"));
    container.addAtom(new Atom("C"));
    container.addBond(0, 1, IBond.Order.SINGLE);
    long[] numbers = InChINumbersTools.getNumbers(container);
    Assert.assertEquals(2, numbers.length);
    Assert.assertEquals(2, numbers[0]);
    Assert.assertEquals(1, numbers[1]);
}