assertThat(ImmutableLongArray.of(13).contains(13)).isTrue();
    assertThat(ImmutableLongArray.of().contains(21)).isFalse();
    assertThat(iia.subArray(1, 5).contains(1)).isTrue();
  }

  public void testForEach() {
    ImmutableLongArray.of().forEach(i -> fail());
    ImmutableLongArray.of(0, 1, 3).subArray(1, 1).forEach(i -> fail());

    AtomicLong count = new AtomicLong(0);
    ImmutableLongArray.of(0, 1, 2, 3)