Phase 5: Integration, E2E, and Regression Tests for Spring Boot Migration

[devin-ai-integration]

Phase 5: Integration, E2E, and Regression Tests for Spring Boot Migration

Summary

Completes Phase 5 of the Struts-to-Spring-Boot migration for faces-example2. This PR adds 139 new tests (234 total, up from 95) covering unit, integration, end-to-end user journeys, and regression scenarios.

Important: This PR also introduces production code that was missing from src-spring-boot/ — specifically RegistrationController, SubscriptionController, their form beans, validation annotations, a WebMvcConfigurer, and all Thymeleaf templates/resources. These were manually rewritten from the legacy src/ versions with corrected imports for the domain.* package structure.

Production code added

• RegistrationController — handles user registration create/edit flows
• SubscriptionController — handles subscription CRUD with session-based auth
• RegistrationForm / SubscriptionForm — form backing beans with Bean Validation
• PasswordMatch / PasswordMatchValidator — custom class-level password matching
• WebMvcConfiguration — view controllers for /welcome, /mainMenu, /
• Thymeleaf templates, messages.properties, static resources copied to src-spring-boot/
• mainMenu.html — null-safe session access (${session?.user?.username})

Test suites added

• ApplicationContextIntegrationTest — verifies all 4 controllers and beans load
• LogonIntegrationTest — full HTTP login/logout flows with session verification
• RegistrationIntegrationTest — create/edit user, duplicate username, validation errors
• SubscriptionIntegrationTest — full CRUD with authenticated sessions, cancel flow
• EndToEndUserJourneyTest — complete Register→Login→Add→Edit→Delete→Logout journey
• RegressionTest — nested test classes covering the Section 5.5 checklist (login, registration, subscription CRUD, logout, page accessibility)
• RegistrationFormTest — Bean Validation constraint tests for all fields (blank, null, invalid email, password mismatch)
• SubscriptionFormTest — Bean Validation constraint tests including @Pattern for type field (imap/pop3 only)
• PasswordMatchValidatorTest — cross-field password validation edge cases (null, empty, mismatch combinations)
• RegistrationControllerTest — @WebMvcTest unit tests for create/edit flows, validation errors, duplicate username, session handling
• SubscriptionControllerTest — @SpringBootTest + @AutoConfigureMockMvc tests for CRUD operations, cancel, delete, validation errors, auth checks

All 234 tests pass.

Updates since last revision

Added 64 unit tests across 5 new test files to close gaps identified in the Migration Plan Section 5.2 (Unit Testing Requirements):

• RegistrationFormTest (16 tests) — Bean Validation for all fields
• SubscriptionFormTest (14 tests) — Bean Validation including @Pattern regex for type
• PasswordMatchValidatorTest (7 tests) — custom validator edge cases
• RegistrationControllerTest (13 tests) — @WebMvcTest with mocked UserDatabase
• SubscriptionControllerTest (14 tests) — uses @SpringBootTest instead of @WebMvcTest because SubscriptionController depends on List<LabelValueBean> which can't be wired in a @WebMvcTest slice

Review & Testing Checklist for Human

• Verify RegistrationController logic matches original src/ behavior — This controller was manually rewritten, not copied. Key areas: password preservation on Edit action (lines 154-162), duplicate username check ordering, error handling. Compare against src/main/java/.../RegistrationController.java.
• Verify SubscriptionController logic matches original src/ behavior — Manually rewritten. Key areas: cancel flow (lines 141-147), delete flow (lines 207-229), session attribute management for SUBSCRIPTION_KEY. Compare against src/main/java/.../SubscriptionController.java.
• Check test isolation — Tests share a single @SpringBootTest context with in-memory database. Tests use System.currentTimeMillis() for unique names, but subscription tests mutate the pre-loaded "user" account. Run tests multiple times to verify no flakiness.
• Verify mainMenu.html null-safe change — Changed ${session.user.username} to ${session?.user?.username}. Confirm this renders correctly when user IS present (not just when absent).
• Test the full user journey manually — Start app, register new user, add subscription, edit it, delete it, logout. Verify all flows work end-to-end in browser.

Test Plan

cd apps/faces-example2
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
mvn clean test -f pom-spring-boot.xml  # All 234 tests should pass
mvn spring-boot:run -f pom-spring-boot.xml  # Smoke test
# Visit http://localhost:8080/struts-faces-example2/welcome
# Test: Register → Login → Add Subscription → Edit → Delete → Logout

Notes

• The dual-source structure (src/ for legacy, src-spring-boot/ for Spring Boot) required copying and adapting files. Import paths were changed from org.apache.struts.webapp.example2.User to org.apache.struts.webapp.example2.domain.User.
• PasswordMatch validation is applied at class level on RegistrationForm, but the controller also manually checks for blank passwords on Create action. This is intentional for better error messages.
• SubscriptionControllerTest uses @SpringBootTest instead of @WebMvcTest because the controller requires a List<LabelValueBean> bean that Spring's @WebMvcTest slice cannot wire. This means these tests load the full application context including the real in-memory database rather than mocks.
• Test coverage: 234 tests total (95 existing + 139 new). Controllers, forms, validators, domain, integration, E2E, and regression all covered.

Link to Devin session: https://jack-meigel.devinenterprise.com/sessions/c08e41f37ed342fa9c630d3f63575ec8
Requested by: @cogjack

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