@Override
    public MetadataNode child(String name) {
        if (name.equals(ClusterImageBrokersNode.NAME)) {
            return new ClusterImageBrokersNode(image);
        } else if (name.equals(ClusterImageControllersNode.NAME)) {
            return new ClusterImageControllersNode(image);
        } else {
            return null;
        }
    }
@Test
    public void testUnknownChild() {
        assertNull(NODE.child("unknown"));
    }