assertThat(UnsignedLongs.decode("0X135791357913579")).isEqualTo(0x135791357913579L);
    assertThat(UnsignedLongs.decode("0")).isEqualTo(0L);
  }

  public void testDecodeLongFails() {
    assertThrows(NumberFormatException.class, () -> UnsignedLongs.decode("0xfffffffffffffffff"));

    assertThrows(NumberFormatException.class, () -> UnsignedLongs.decode("-5"));