List<String> expected = Lists.newArrayList("foo", "bar");
    List<String> actual = Lists.newArrayList(filtered);
    assertEquals(expected, actual);
  }

  public void testFilterNothing() {
    Iterator<String> unfiltered = Collections.<String>emptyList().iterator();
    Iterator<String> filtered =
        filter(
            unfiltered,
            new Predicate<String>() {

    List<String> expected = Lists.newArrayList("foo", "bar");
    List<String> actual = Lists.newArrayList(filtered);
    assertEquals(expected, actual);
  }

  public void testFilterNothing() {
    Iterator<String> unfiltered = Collections.<String>emptyList().iterator();
    Iterator<String> filtered =
        filter(
            unfiltered,
            new Predicate<String>() {