TEST Code 를 실행하니 에러가??
Bean으로 등록하지 않으니 문제가 해결되었다.
https://stackoverflow.com/questions/58598448/why-authenticationmanager-is-throwing-stackoverflowerror
https://stackoverflow.com/questions/73929257/springboottest-annotation-resulting-in-stackoverflowerror
https://hbyun.tistory.com/178