ImmutableLongArray iia = ImmutableLongArray.copyOf(list);
    list.set(2, 2L);
    assertThat(iia.asList()).containsExactly(0L, 1L, 3L).inOrder();
  }

  public void testCopyOf_stream() {
    assertThat(ImmutableLongArray.copyOf(LongStream.empty()))
        .isSameInstanceAs(ImmutableLongArray.of());
    assertThat(ImmutableLongArray.copyOf(LongStream.of(0, 1, 3)).asList())