@Test
  public void testGetWorldMap() {

    facet.set(0, 1, 2, 4);
    facet.set(0, 1, 3, 3);
    facet.set(9, 3, 1, 2);

    facet.setWorld(13, 28, 34, 2);
    facet.setWorld(10, 21, 35, 1);

    Map<Vector3i, Number> expected =
        ImmutableMap.<Vector3i, Number>of(
            new Vector3i(10, 21, 32), 4,
            new Vector3i(10, 21, 33), 3,
            new Vector3i(13, 28, 34), 2,
            new Vector3i(10, 21, 35), 1,
            new Vector3i(19, 23, 31), 2);

    Assert.assertEquals(expected, facet.getWorldEntries());
  }