}

  public void testLast_null() {
    List<String> list = Lists.newArrayList("a", "b", null);
    assertThrows(NullPointerException.class, () -> FluentIterable.from(list).last());
  }

  public void testLast_emptyList() {
    List<String> list = emptyList();
    assertThat(FluentIterable.from(list).last()).isAbsent();
  }

  public void testLast_sortedSet() {