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🧠 Rules by Layer

1. Domain Layer (src/domain)

• Type: Pure Unit Tests.
• Mocks: ❌ NONE.
• Focus: Test business logic, Zod schema validations (.parse()), and utility functions.
• Example: expect(productSchema.parse(invalidData)).toThrow().

2. Application Layer (src/application)

• Type: Unit Tests.
• Mocks: ✅ Mock Infrastructure Repositories and Zustand Stores.
• Focus:
  • Test queryOptions generation keys.
  • Test complex hooks logic (use renderHook).
  • Test Zustand actions (state mutations).
• Tooling: vi.spyOn, mockZustand.

3. Infrastructure Layer (src/infrastructure)

• Type: Integration Tests.
• Mocks: ✅ Mock HTTP Network (use msw or nock).
• Focus:
  • Verify Repositories call the correct endpoints.
  • Verify Mappers correctly transform API DTOs -> Domain Entities.
  • Verify DTOs match expected API shapes.

4. Presentation Layer (src/presentation)

• Type: Component Integration Tests.
• Mocks: ✅ Mock Application Layer Hooks (e.g., useProductDetail).
• Forbidden: ❌ NEVER mock axios, fetch, or useQuery directly in components.
• Focus:
  • Test UI rendering based on data states (Success, Empty).
  • Test User Interactions (Click, Type) firing handlers.
  • Test Accessibility (aria-labels).
• Tooling: render, screen, userEvent.

📝 Conventions

• Naming: Filename.test.tsx or Filename.spec.ts.
• Location: Co-located next to the source file.
• Async: Always use await screen.findBy* for async elements, never wait().

Keywords

vitest, react-testing-library, rtl, user-event, msw, unit-testing, integration-testing, mocks.