Add comprehensive @WebMvcTest for PatronProfileController

[callummiles]

Add comprehensive @WebMvcTest for PatronProfileController

Summary

This PR adds comprehensive unit tests for the PatronProfileController REST API, which previously had zero test coverage despite being a critical 189-line controller handling all patron profile operations.

Changes:

• Added PatronProfileControllerTest.groovy with 15 test cases covering all 7 HTTP endpoints
• Tests validate success scenarios, error handling (404s, 500s), HATEOAS links, and request/response mapping
• All service dependencies (PatronProfiles, PlacingOnHold, CancelingHold) are properly mocked using @MockBean
• Updated README.md to document the new test coverage under the Tests section

Test Coverage:

• ✅ GET /profiles/{patronId} - patron profile with HATEOAS links
• ✅ GET /profiles/{patronId}/holds/ - holds collection (with/without data)
• ✅ GET /profiles/{patronId}/holds/{bookId} - specific hold (200/404)
• ✅ GET /profiles/{patronId}/checkouts/ - checkouts collection (with/without data)
• ✅ GET /profiles/{patronId}/checkouts/{bookId} - specific checkout (200/404)
• ✅ POST /profiles/{patronId}/holds - place hold (200/500)
• ✅ DELETE /profiles/{patronId}/holds/{bookId} - cancel hold (204/404/500)

Technical Notes:

• Uses @WebMvcTest(PatronProfileController.class) for focused controller testing
• Requires @Import(WebConfiguration.class) for HATEOAS support (WebConfiguration is excluded by default in @WebMvcTest)
• Uses Mockito's when().thenReturn() API for mocking (not Spock's >>) because @MockBean creates Mockito mocks
• Domain models use fully qualified names to avoid shadowing controller's inner DTO classes

Review & Testing Checklist for Human

• Run tests locally: Execute mvn test -Dtest=PatronProfileControllerTest to verify all 15 tests pass
• Review test assertions: Check that the assertions actually validate the expected behavior, especially for HATEOAS links and error scenarios
• Verify mocking accuracy: Confirm the mocked service behavior represents realistic scenarios (e.g., Try.success(), Try.failure(), Option.some(), Option.none())
• Consider integration tests: These are pure unit tests with mocked dependencies - determine if integration tests are also needed for this controller
• Check edge cases: Review if additional error scenarios should be tested (validation errors, business rule violations, etc.)

Notes

• All tests passed locally with 0 failures, 0 errors
• This addresses the gap in test coverage for the patron profile REST API layer
• The test file follows Groovy/Spock patterns from existing tests but deviates in mocking strategy due to @MockBean requirements

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Link to Devin run: https://app.devin.ai/sessions/7cd5d6d1d4ca463f9b509eeeb5246aad
Requested by: @callummiles

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[callummiles]

remember to update the readme with any changes you made