test: add unit tests for Backend controllers

[snowrugar-beep]

Problem Statement

Backend controllers are only tested via E2E tests, which are slow and require a running database. Controller logic (route handling, parameter binding, validation integration, response formatting) has no fast-feedback unit test suite.

Evidence

• No spec files for gists.controller.ts or health.controller.ts
• Only E2E tests exist for controller behavior

Impact

Controller logic has no fast-feedback test suite. Changes require running E2E tests (~30 seconds) vs unit tests (~1 second).

Proposed Solution

1. Create gists.controller.spec.ts with mocked GistsService
2. Create health.controller.spec.ts with mocked DataSource
3. Test: request validation, parameter binding, response formatting, error handling

Technical Requirements

• Must use @nestjs/testing with custom providers
• Must test all controller methods
• Must test both success and error paths

Acceptance Criteria

1. GistsController.create: validates POST returns correct shape, calls service with DTO
2. GistsController.findNearby: validates query parameters passed to service
3. GistsController.findOne: validates ID parameter passed to service
4. HealthController.check: validates health response shape
5. Error responses handled correctly
6. All tests pass

File Inventory

• Backend/src/gists/gists.controller.ts (add spec)
• Backend/src/health/health.controller.ts (add spec)

Dependencies

None.

Testing Strategy

Unit tests with mocked services. No database or network access required.

Security Considerations

Testing controller validation prevents security-relevant request handling bugs.

Definition of Done

• Controller tests created
• All methods tested
• All tests passing

[MicD746]

Hello Maintainer, please can I work on this issue and give you a better result

[Hassanmovic98]

This is straightforwardmock GistsService and DataSource, test each controller method with valid and invalid inputs, verify response shapes and service calls. I'll create gists.controller.spec.ts and health.controller.spec.ts with full coverage of success and error paths. Tests will run in seconds with no database setup required.

[grantfox-oss]

🦊 GrantFox — @Hassanmovic98 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #42)
2. Your PR will be reviewed by the VertexChainLabs maintainers

Good luck! Track your progress on GrantFox.