public void testToArray_withNull() {
    List<@Nullable Long> list = Arrays.asList(0L, 1L, null);
    assertThrows(NullPointerException.class, () -> Longs.toArray(list));
  }

  public void testToArray_withConversion() {
    long[] array = {0L, 1L, 2L};

    List<Byte> bytes = Arrays.asList((byte) 0, (byte) 1, (byte) 2);
    List<Short> shorts = Arrays.asList((short) 0, (short) 1, (short) 2);