@Test
 public void testSortValue() {
   GenericUserPreferenceArray prefs = new GenericUserPreferenceArray(3);
   prefs.set(0, new GenericPreference(1L, 3L, 5.0f));
   prefs.set(1, new GenericPreference(1L, 1L, 4.0f));
   prefs.set(2, new GenericPreference(1L, 2L, 3.0f));
   prefs.sortByValue();
   assertEquals(2L, prefs.getItemID(0));
   assertEquals(1L, prefs.getItemID(1));
   assertEquals(3L, prefs.getItemID(2));
   prefs.sortByValueReversed();
   assertEquals(3L, prefs.getItemID(0));
   assertEquals(1L, prefs.getItemID(1));
   assertEquals(2L, prefs.getItemID(2));
 }