@SuppressWarnings("UseCollectionConstructor") // test of factory method
    HashSet<Integer> set = newHashSet();
    verifySetContents(set, EMPTY_COLLECTION);
  }

  public void testNewHashSetVarArgs() {
    HashSet<Integer> set = newHashSet(0, 1, 1);
    verifySetContents(set, asList(0, 1));
  }

  public void testNewHashSetFromCollection() {