데이터 수정 테스트 코드 package com.kyhslam; import java.util.Optional; import java.util.stream.Stream; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import com.kyhslam.domain.Board; import com.kyhslam.persistence..