assertFalse(values.retainAll(asList(null, 0, 15, 1500)));
      checkEmpty(values);
      checkEmpty(cache);
    }
  }

  /* ---------------- Entry Set -------------- */

  public void testEntrySet_nullToArray() {
    for (LoadingCache<Object, Object> cache : caches()) {
      Set<Entry<Object, Object>> entries = cache.asMap().entrySet();
      assertThrows(