}

  public void testFromIpv6BigIntegerThrowsLessThanZero() {
    IllegalArgumentException expected =
        assertThrows(
            IllegalArgumentException.class,
            () -> InetAddresses.fromIPv6BigInteger(BigInteger.valueOf(-1L)));
    assertEquals("BigInteger must be greater than or equal to 0", expected.getMessage());
  }

  public void testFromIpv4BigIntegerValid() {

   * @return Inet6Address representation of the given BigInteger
   * @throws IllegalArgumentException if the BigInteger is not between 0 and 2^128-1
   * @since 28.2
   */
  public static Inet6Address fromIPv6BigInteger(BigInteger address) {
    return (Inet6Address) fromBigInteger(address, true);
  }

  /**
   * Converts a BigInteger to either an IPv4 or IPv6 address. If the IP is IPv4, it must be

   * @return Inet6Address representation of the given BigInteger
   * @throws IllegalArgumentException if the BigInteger is not between 0 and 2^128-1
   * @since 28.2
   */
  public static Inet6Address fromIPv6BigInteger(BigInteger address) {
    return (Inet6Address) fromBigInteger(address, true);
  }

  /**
   * Converts a BigInteger to either an IPv4 or IPv6 address. If the IP is IPv4, it must be