}
  }

  public void testFirst_emptyList() {
    List<String> list = Collections.emptyList();
    assertThat(FluentIterable.from(list).first()).isAbsent();
  }

  public void testFirst_sortedSet() {
    SortedSet<String> sortedSet = ImmutableSortedSet.of("b", "c", "a");
    assertThat(FluentIterable.from(sortedSet).first()).hasValue("a");
  }

  public void testFirst_emptySortedSet() {