Testing DDD Layers with pytest (Domain / UseCase)

This skill focuses on unit tests for the inner layers:

• Domain: Value Objects + Entities (pure business rules)
• UseCase: application workflows that orchestrate Domain + Repository interfaces

It intentionally avoids full HTTP/API tests unless explicitly requested.

Test strategy (recommended)

1. Domain tests: no mocks, assert invariants and state transitions.
2. UseCase tests: mock repository interfaces (Mock(spec=...)), assert:
   • correct repository method calls
   • correct domain exceptions raised
   • correct entity state transitions
3. Infrastructure/Presentation: add integration tests separately (optional).

Folder structure