assertThat(expected)
        .hasMessageThat()
        .isEqualTo("BigInteger must be greater than or equal to 0");
  }

  public void testFromIpv6BigIntegerThrowsLessThanZero() {
    IllegalArgumentException expected =
        assertThrows(
            IllegalArgumentException.class,
            () -> InetAddresses.fromIPv6BigInteger(BigInteger.valueOf(-1L)));