Add complex unification test scenarios

[Copilot]

Purpose

Adds comprehensive integration tests for complex profile unification scenarios that go beyond the existing basic test coverage.

Goals

Validate edge cases and complex merge hierarchies in the profile unification engine, including cascading merges, deep hierarchies, and transitive relationships.

Approach

Created test/integration/complex_unification_test.go with 9 new test scenarios:

• Scenario10: Multiple cascading merges with 4+ temporary profiles
• Scenario11: Deep hierarchy unification (merged profiles becoming children of new master)
• Scenario12: Application data merge across multiple profiles
• Scenario13: Update profile triggers re-unification
• Scenario14: Multiple identity attributes matching with priority resolution
• Scenario15: Chain unification (A→B→C→D cascade)
• Scenario16: Permanent profile + multiple temps unification
• Scenario17: Different trait types with combine/overwrite strategies
• Scenario18: Rule reactivation behavior

User stories

As a developer, I need confidence that complex unification scenarios work correctly before deploying profile unification features.

Release note

Added integration tests covering complex profile unification scenarios including cascading merges, deep hierarchies, and transitive relationships.

Documentation

N/A - Test-only changes

Training

N/A

Certification

N/A - Test infrastructure only

Marketing

N/A

Automation tests

• Unit tests

  N/A

• Integration tests

  9 new complex unification test scenarios added. All 18 total unification tests pass (9 existing + 9 new).

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes (CodeQL - no alerts)
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

N/A

Related PRs

N/A

Migrations (if applicable)

N/A

Test environment

Go, PostgreSQL (via testcontainers), Linux

Learning

Built on existing test patterns in profile_unification_test.go, extending coverage to complex merge hierarchies and edge cases.

Warning

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Original prompt

Create complex unification testing

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[iransamarasekara]

Everything looks good