Managers 테스트 구현

[yjeong-k]

PR Title: Managers 테스트 구현

Related Issue(s):

DAO 테스트 작성하신 것 참고하여, Context를 사용하는 SettingsPrefsManager, AuthTokenPrefsManager, UserIdPrefsManager는 Test가 아닌 androidTest에 작성하였습니다..!

PR Description:

4가지 managers에 대한 테스트를 구현하였습니다.
상기한 세 가지 manager 외, SessionManager의 coverage는 다음과 같습니다.

Changes Included:

• Added new feature(s)
• Fixed identified bug(s)
• Updated relevant documentation

Notes for Reviewer:

Any specific instructions or points to be considered by the
reviewer.

Reviewer Checklist:

• Code is written in clean, maintainable, and idiomatic form.
• Automated test coverage is adequate.
• All existing tests pass.
• Manual testing has been performed to ensure the PR works as expected.
• Code review comments have been addressed or clarified.

Additional Comments:

Add any other comments or information that might be useful for the
review process.

[JH747]

테스트 모두 pass하고 있고 SessionManager의 coverage도 좋습니다.
고생하셨습니다.