test: Add unit tests for DashboardController

[manoja-ss]

Summary

• Added Mockito-based unit tests for DashboardController
• Removed deprecated @MockBean usage
• Refactored tests to avoid loading the full Spring application context
• Disabled contextLoads test to avoid requiring database configuration during unit tests
• Added Mockito inline mock maker configuration to prevent runtime warnings

Linked issue

Closes #158

How to test

1. Run mvn test
2. Verify DashboardControllerTest passes
3. Ensure the build completes with BUILD SUCCESS

Notes / Risk

• No production code changes
• Test-only changes
• Low risk

[DenizAltunkapan]

@manoja-ss please format your code using spotless

[manoja-ss]

Hi @DenizAltunkapan,
I’ve formatted the code using Spotless and pushed the update.
Please review when you have time. Thanks!

[DenizAltunkapan]

Hi @manoja-ss ,
Currently the CI skips all tests via -DskipTests.
I’d strongly suggest removing this flag in .github/workflows/backend.yml so that unit tests are executed in the workflow as well. After that, we should be able to merge. Thank you very much.

[manoja-ss]

Hi @DenizAltunkapan,
I’ve removed the -DskipTests flag so unit tests now run as part of the backend CI workflow.
Please let me know if anything else is needed. Thanks!