assertThat(headers.type).isEqualTo(Http2.TYPE_HEADERS)
    val data1 = peer.takeFrame()
    assertThat(data1.type).isEqualTo(Http2.TYPE_DATA)
    assertThat(data1.streamId).isEqualTo(3)
    assertArrayEquals("abcde".toByteArray(), data1.data)
    val data2 = peer.takeFrame()
    assertThat(data2.type).isEqualTo(Http2.TYPE_DATA)
    assertThat(data2.streamId).isEqualTo(3)

    assertThat(i.hasNext()).isTrue();
    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)