throw new UnsupportedOperationException();
    }

    @Override
    protected Queue<T> delegate() {
      return queue;
    }
  }

  public void testIndexOf_empty() {
    List<String> list = new ArrayList<>();
    assertEquals(-1, Iterables.indexOf(list, equalTo("")));
  }

  public void testIndexOf_oneElement() {
    List<String> list = Lists.newArrayList("bob");