@Override
    public Collection<String> childNames() {
        ArrayList<String> childNames = new ArrayList<>();
        childNames.add("name");
        childNames.add("id");
        for (Integer partitionId : image.partitions().keySet()) {
            childNames.add(partitionId.toString());
        }
        return childNames;
    }
@Test
    public void testChildNames() {
        assertEquals(Arrays.asList("name", "id", "0"), NODE.childNames());
    }