try {
      assertFalse(entrySet.contains(nullKeyValueEntry));
    } catch (NullPointerException e) {
      assertFalse(allowsNullKeys && allowsNullValues);
    }
  }

  public void testEntrySetIteratorRemove() {
    Map<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return;
    }

    Set<Entry<K, V>> entrySet = map.entrySet();