test: add generate verification code test

[reddevilmidzy]

♟️ What’s this PR about?

간단한 테스트 코드 추가(사실 codecov 코멘트 다는 것 확인하는 용)

[Copilot]

Pull Request Overview

This PR adds a basic unit test for the generate_verification_code function to verify that it produces a 6-digit numeric verification code. The test is being added primarily to check codecov comment functionality.

• Adds test coverage for the generate_verification_code function
• Verifies the generated code format (6 digits, all numeric characters)

Comments suppressed due to low confidence (1)

rook/src/domain/email_verification.rs:185

• The test only verifies format but doesn't test the randomness property. Consider adding a test that generates multiple codes to ensure they are different, as predictable codes could be a security concern.

    fn test_generate_verification_code() {

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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