assertThat(iia.get(0)).isEqualTo(0L);
    assertThat(iia.get(2)).isEqualTo(3L);
    assertThat(iia.subArray(1, 3).get(1)).isEqualTo(3L);
  }

  public void testGet_bad() {
    ImmutableLongArray iia = ImmutableLongArray.of(0, 1, 3);
    assertThrows(IndexOutOfBoundsException.class, () -> iia.get(-1));
    assertThrows(IndexOutOfBoundsException.class, () -> iia.get(3));