@Test
 public void testHasPref() {
   GenericUserPreferenceArray prefs = new GenericUserPreferenceArray(3);
   prefs.set(0, new GenericPreference(1L, 3L, 5.0f));
   assertTrue(prefs.hasPrefWithItemID(3L));
   assertTrue(prefs.hasPrefWithUserID(1L));
   assertFalse(prefs.hasPrefWithItemID(2L));
   assertFalse(prefs.hasPrefWithUserID(2L));
 }