test: add test for NewSubscriber struct

[reddevilmidzy]

♟️ What’s this PR about?

NewSubscriber에 대한 간단한 테스트 추가하였습니다 (커버리지 확인용)

🔗 Related Issues / PRs

[Copilot]

Pull Request Overview

This PR introduces a unit test for the NewSubscriber struct to verify its constructor and getter methods.

• Adds a test for creating a NewSubscriber and checking its email, repository_url, and branch getters.
• Uses valid sample values to assert equality of returned fields.

Comments suppressed due to low confidence (1)

rook/src/domain/new_subscriber.rs:51

• Consider adding a test case where branch is None to ensure branch() correctly returns None when no branch is provided.

        assert_eq!(subscriber.branch(), branch.as_ref());

[coveralls-official]

Pull Request Test Coverage Report for Build 16323105496

Details

• 9 of 9 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.4%) to 74.414%

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Totals
Change from base Build 16322081308:	0.4%
Covered Lines:	1588
Relevant Lines:	2134

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💛 - Coveralls

[reddevilmidzy]

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