add-testing-foundation

name	add-testing-foundation
description	Use when introducing or expanding tests in LuckyPlans, especially service logic, shared utilities, controllers, and resolvers.

Add Testing Foundation

Priority Order

1. packages/shared/src/utils/* (pure utility tests first)
2. apps/service-core/src/*.service.ts
3. apps/service-core/src/*.controller.ts
4. apps/api-gateway/src/*/*.resolver.ts

Rules

• Test public behavior, not framework internals.
• Keep tests focused and clearly named.
• Co-locate tests as *.spec.ts.
• Mock dependencies (CoreService, ClientProxy) in controller/resolver tests.

Checklist

1. Add/extend tests in touched areas.
2. Mock external dependencies and transport boundaries.
3. Verify expected routing/delegation in controllers/resolvers.
4. Run project validation commands before completion.