test(service) : Added some unit tests for MMU-API

[Zapper9982]

📋 Description

JIRA ID:

• This PR adds and refines comprehensive unit tests to achieve 100% test coverage for key service classes in the MMU-API project.
• All business logic, branches, and edge cases are now thoroughly tested, ensuring robust coverage and reliability.
• No errors or regressions have been found in the API service as a result of these changes.

@drtechie @vanitha1822

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✅ Type of Change

• 🐞 Bug fix
• ✨ New feature
• 🔥 Breaking change
• 🛠 Refactor
• ⚙️ Config change
• 📚 Documentation
• 🧪 Tests (adding new or updating existing tests)
• 🎨 UI/UX
• 🚀 Performance
• 🧹 Chore

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Screenshots

N/A – This PR only affects backend unit tests and does not introduce UI changes.

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Additional Notes:

• All tests pass successfully, and coverage reports confirm 100% coverage for the targeted service classes.
• These improvements will help ensure future changes are safe

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[Zapper9982]

@vanitha1822 the merge conflicts occur because :

• there was a security bug of not checking if dataToBesync is null .
• changed private to protected for a JDBC template to make it accessible for test
• updated long to Long since Long is an object and can be initialized as null , unlike long being a primitive datatype. (since duration initialized as null return can be expected to be null too )

Can you please review these changes . these are some few refactor I have done as that can be seen in the PR .

[sonarqubecloud]

Quality Gate passed

Issues
169 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud