@Test public void diceSpliteratorIsNonNull() {

  Spliterator<?> spliterator = asList(1).spliterator();
  assertThat(spliterator.hasCharacteristics(Spliterator.NONNULL)).isFalse();
  assertThat(MoreStreams.dice(spliterator, 2).hasCharacteristics(Spliterator.NONNULL)).isTrue();
}