[Spring Boot] Test 인증번호 6자리

- RandomTest

package dev.shlee.studymemberbbs;

import dev.shlee.studymemberbbs.entities.member.UserEntity;
import dev.shlee.studymemberbbs.enums.CommonResult;
import dev.shlee.studymemberbbs.enums.member.SendEmailAuthResult;
import org.apache.commons.lang3.RandomStringUtils;
import org.junit.jupiter.api.Test;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class RandomTest {
    @Test
    public void test() throws NoSuchAlgorithmException { //UserEntity에게 이메일 검증을 요청하겠다. user은 controller에서 받아온다.
        String authCode = RandomStringUtils.randomNumeric(6); //6자의 랜덤한 문자열 가져오기
        String authSalt = String.format("%s%s%f%f",
                "ljh5968@naver.com",
                authCode,
                Math.random(),
                Math.random());
        System.out.println(authSalt);
        StringBuilder authSaltHashBuilder = new StringBuilder();
        MessageDigest md = MessageDigest.getInstance("SHA-512");
        md.update(authSalt.getBytes(StandardCharsets.UTF_8));
        for (byte hashByte : md.digest()) {
            authSaltHashBuilder.append(String.format("%02x", hashByte));
        }
        authSalt = authSaltHashBuilder.toString();
        System.out.println(authSalt);
    }
    
}