@Test
public void isEmptyTest() {

    Assert.assertFalse("The setUp method should have made an orbit with " + "some indices in it", orbit.isEmpty());
    List<Integer> indices = new ArrayList<Integer>();
    for (int index : orbit) {
        indices.add(index);
    }
    for (int index : indices) {
        orbit.remove(index);
    }
    Assert.assertTrue("Orbit should now be empty", orbit.isEmpty());
}