Add comprehensive unit tests for PatronProfileController

[devin-ai-integration]

Add comprehensive unit tests for PatronProfileController

Summary

This PR adds comprehensive unit tests for the PatronProfileController REST API using Spring Boot's @WebMvcTest annotation and Spock framework. The controller previously had zero test coverage despite being a critical 189-line Spring Boot REST controller handling all patron profile operations.

Test Coverage Added:

• All 8 HTTP endpoints: GET profile, GET/POST/DELETE holds, GET checkouts
• Request/response mapping and JSON serialization
• Error scenarios (404, 500 status codes)
• HATEOAS links and affordances verification
• Edge cases: empty collections, multiple items, invalid JSON
• Proper service dependency mocking (PatronProfiles, PlacingOnHold, CancelingHold)

The test follows existing codebase patterns using Spock's given/when/then structure and includes 17 comprehensive test methods covering success cases, error cases, and edge cases.

Review & Testing Checklist for Human

⚠️ CRITICAL - 4 items to verify due to environment limitations during development:

• Verify tests compile and run successfully - Due to environment compilation issues, these tests could not be executed during development to verify they work correctly
• Check mock configurations are correct - Verify the @TestConfiguration with DetachedMockFactory properly creates mocks that Spring can inject
• Validate HATEOAS JSON assertions - Confirm the jsonPath assertions match the actual JSON structure returned by Spring HATEOAS (e.g., $._embedded.holdList, $._links.self.href)
• Test end-to-end functionality - Run a few manual API calls to compare actual responses with test expectations, especially for collection endpoints and error scenarios

Notes

• Tests use @WebMvcTest(PatronProfileController) for lightweight web layer testing
• Service dependencies are stubbed using Spock's Stub() mechanism
• All 17 test methods follow the existing Spock patterns found throughout the codebase
• Link to Devin run: https://app.devin.ai/sessions/6fd175de84cc422bab47d70886717fb4
• Requested by: @callummiles (callum.miles@windsurf.com)

[devin-ai-integration]

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[callummiles]

make sure to also update the readme with the changes you made