}

  public void testNewConcurrentHashSetEmpty() {
    Set<Integer> set = Sets.newConcurrentHashSet();
    verifySetContents(set, EMPTY_COLLECTION);
  }

  public void testNewConcurrentHashSetFromCollection() {
    Set<Integer> set = Sets.newConcurrentHashSet(SOME_COLLECTION);
    verifySetContents(set, SOME_COLLECTION);
  }

  public void testNewLinkedHashSetEmpty() {