}

  public void testNewEnumSet_empty() {
    EnumSet<SomeEnum> copy = newEnumSet(Collections.<SomeEnum>emptySet(), SomeEnum.class);
    assertEquals(EnumSet.noneOf(SomeEnum.class), copy);
  }

  public void testNewEnumSet_enumSet() {
    EnumSet<SomeEnum> set = EnumSet.of(SomeEnum.A, SomeEnum.D);
    assertEquals(set, newEnumSet(set, SomeEnum.class));
  }

  public void testNewEnumSet_collection() {

   * natural order. This method behaves identically to {@link EnumSet#copyOf(Collection)}, but also
   * accepts non-{@code Collection} iterables and empty iterables.
   */
  public static <E extends Enum<E>> EnumSet<E> newEnumSet(
      Iterable<E> iterable, Class<E> elementType) {
    EnumSet<E> set = EnumSet.noneOf(elementType);
    Iterables.addAll(set, iterable);
    return set;
  }

  // HashSet

  /**