public int next() {
        while(ordinal < previousOrdinalsLength) {
            ordinal = populatedOrdinals.nextClearBit(ordinal + 1);
            if(previousOrdinals.get(ordinal))
                return ordinal;
        }

        return ORDINAL_NONE;
    }
@Test
    public void iteratesOverRemovedOrdinals() {
        RemovedOrdinalIterator iter = new RemovedOrdinalIterator(PREVIOUS_ORDINALS, CURRENT_ORDINALS);

        Assert.assertEquals(2, iter.next());
        Assert.assertEquals(6, iter.next());
        Assert.assertEquals(10, iter.next());
        Assert.assertEquals(-1, iter.next());
    }