// no way to find out the stream is empty without walking its spliterator
    assertThat(findLast(list.stream().filter(i -> i < 0))).isEmpty();
  }

  public void testFindLast_intStream() {
    assertThat(findLast(IntStream.of())).isEqualTo(OptionalInt.empty());
    assertThat(findLast(IntStream.of(1, 2, 3, 4, 5))).isEqualTo(OptionalInt.of(5));

    // test with a large, not-subsized Spliterator