test: JwtService/UserIdResolver 단위 테스트 추가 + dev CI 테스트 실행

[unam98]

배경

프로젝트에 실질적인 테스트 코드가 전무했음 (ServerApplicationTests.contextLoads() 하나뿐, 로직 검증 없음). 게다가 dev-ci.yml이 -x test로 테스트 실행 자체를 건너뛰고 있어서, 테스트를 짜도 CI에서 검증이 안 되는 상태였음.

오늘 MDC userId 로깅 작업(#211) 하면서 만든 JwtService/UserIdResolver부터 테스트 커버리지 시작.

변경 사항

• JwtServiceTest: 토큰 발급 후 검증 성공, userId 클레임 추출, 형식 오류/만료 토큰 판정
• UserIdResolverTest: accessToken/refreshToken 누락, 방문자 모드, 만료/무효 토큰, 정상 토큰의 userId 파싱 및 MDC 반영, 숫자 아닌 클레임 예외
• dev-ci.yml: -x test 제거

검증

• 로컬에서 신규 테스트 12개 전부 통과 (JwtServiceTest 4개, UserIdResolverTest 8개)
• 로컬 DB/Redis 띄우고 ./gradlew build 전체(기존 ServerApplicationTests 포함) 통과 확인

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📥 Commits

Reviewing files that changed from the base of the PR and between c8055b0 and 4c83df7.

📒 Files selected for processing (3)

• .github/workflows/dev-ci.yml
• src/test/java/org/runnect/server/common/resolver/userId/UserIdResolverTest.java
• src/test/java/org/runnect/server/config/jwt/JwtServiceTest.java

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