@Test
    public final void testLeafInterator() {
        int count = 0;
        Iterator<SpatialTree<Sphere>> it;

        SpatialTree<Sphere> tree = new SpatialTree<Sphere>(objects);

        it = tree.leafInterator();

        while (it.hasNext()) {
            assertTrue(it.next() instanceof SpatialTree<?>);
            count++;
        }
        //System.out.println(count);

        // fail("Not yet implemented");
    }