assertThat(i.next()).isEqualTo(1);
    assertThat(i.hasNext()).isFalse();
  }

  public void testSingletonNullIteratorBasic() {
    Iterator<@Nullable Integer> i = singletonIterator(null);
    assertThat(i.hasNext()).isTrue();
    assertThat(i.next()).isEqualTo(null);
    assertThat(i.hasNext()).isFalse();
  }

  @GwtIncompatible // slow (~4s)

    Iterator<TypeB> expectedIterator = Arrays.<TypeB>asList(hasBoth1, hasBoth2).iterator();
    blist.forEach(b -> assertThat(b).isEqualTo(expectedIterator.next()));
    assertThat(expectedIterator.hasNext()).isFalse();
  }

  public void testTransform_iterator() {
    List<String> input = asList("1", "2", "3");
    Iterable<Integer> result =
        Iterables.transform(
            input,