인프런 커뮤니티 질문&답변

accountTransferEX 에서 assertThatThrownBy를 주석처리하고

 @Test
 @DisplayName("이체중 예외 발생")
   void accountTransferEX() throws SQLException {
      Member memberA = new Member(MEMBER_A, 10000);
      Member memberEx = new Member(MEMBER_EX, 10000);
      memberRepository.save(memberA);
      memberRepository.save(memberEx);

//        assertThatThrownBy(() -> memberService.accountTransfer(memberA.getMemberId(), memberEx.getMemberId(), 2000))
//                .isInstanceOf(IllegalStateException.class);
      memberService.accountTransfer(memberA.getMemberId(), memberEx.getMemberId(), 2000);

      Member findMemberA = memberRepository.findById(memberA.getMemberId());
      Member findMemberB = memberRepository.findById(memberEx.getMemberId());
      assertThat(findMemberA.getMoney()).isEqualTo(10000);
      assertThat(findMemberB.getMoney()).isEqualTo(10000);
    }
}

accountTransfer 에서 throw new IllegalStateException(e)를 주석처리했습니다.

public void accountTransfer(String fromId, String toId, int money) throws SQLException {
    Connection con = dataSource.getConnection();
    try{
        con.setAutoCommit(false); 
        bizLogic(con, fromId, toId, money);
        con.commit();
    }catch (Exception e){
        con.rollback(); 
        //throw new IllegalStateException(e);
    } finally{
        release(con);
    }

}

제가 생각했을 때는 어차피 예외가 터지면 롤백할거니까 예외(IllegalStateException)를 걍 먹고(?) 끝내버리면 된다고 생각하는데 assertThatThrownBy를 이용하는 이유는 예외가 발생할 수 있는 코드가 있다는 것을 인지하기 위해서인가요??

답변 주시면 정말 감사하겠습니다.