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

  public void testFromIpv4BigIntegerValid() {
    checkBigIntegerConversion("0.0.0.0", BigInteger.ZERO);
    checkBigIntegerConversion("0.0.0.1", BigInteger.ONE);
    checkBigIntegerConversion("127.255.255.255", BigInteger.valueOf(Integer.MAX_VALUE));