Add comprehensive @WebMvcTest for PatronProfileController

[callummiles]

Add comprehensive @WebMvcTest for PatronProfileController

Summary

Created PatronProfileControllerTest with 16 test methods providing comprehensive coverage for the PatronProfileController REST API, which previously had zero test coverage. The controller is a critical 189-line Spring Boot REST endpoint that handles all patron profile operations including viewing holds/checkouts, placing holds, and canceling holds.

Test Coverage:

• ✅ All 7 REST endpoints tested (GET profile, GET/POST/DELETE holds, GET checkouts)
• ✅ Success scenarios with proper status codes and JSON structure
• ✅ Error scenarios (404 for not found, 500 for failures)
• ✅ HATEOAS link verification
• ✅ Request/response deserialization
• ✅ Service method invocation with correct command objects (verified using ArgumentCaptor)

Technical Implementation:

• Used @WebMvcTest for focused controller testing with MockMvc
• Added @Import(PatronProfileController.class) to load the package-private controller (required workaround for Spring Boot 2.2.0.M6)
• Mocked three service dependencies: PatronProfiles, PlacingOnHold, CancelingHold
• Used fully qualified names for domain model Hold and Checkout classes to avoid naming conflicts with DTO classes in the same package

Verification:

• All 16 new tests passing
• Full test suite passing (105 tests total, 0 failures)

Review & Testing Checklist for Human

• Verify mock behaviors align with real service implementations - The tests use mocked services with Try.success() and Try.failure() returns. Confirm these match actual service behavior patterns.
• Review the @import annotation workaround - This was needed because the controller is package-private and @WebMvcTest doesn't load it automatically in Spring Boot 2.2.0.M6. Confirm this doesn't cause issues with Spring context loading.
• Check HATEOAS link structure - Tests verify links exist but don't validate URL patterns. Spot-check that the actual HATEOAS links match Spring conventions.

Test Plan

The tests compile and pass in CI, which validates the basic correctness. For additional confidence (optional):

1. Run mvn test -Dtest=PatronProfileControllerTest locally to verify tests pass
2. Optionally, start the app with mvn spring-boot:run and manually test endpoints using curl or Postman

Notes

• Naming conflict handling: Domain model classes Hold and Checkout have the same names as DTO classes in the web package, requiring fully qualified names in tests (e.g., io.pillopl.library.lending.patronprofile.model.Hold). This is verbose but necessary to avoid compiler ambiguity.
• Testing approach: These are isolated unit tests with mocked dependencies. Integration tests with real services would provide additional coverage but are outside the scope of this PR.

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Link to Devin run: https://app.devin.ai/sessions/258206744c384290a03d110709563319
Requested by: @callummiles

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