Mocking in PHPUnit (Test Services Without Real DB)

Mocking means replacing a real dependency with a fake one, so tests stay fast and reliable. ## Example scenario A service depends on a repository. In tests: - you do not want to hit real DB - you only want to test business logic ## The idea (simple) ```mermaid flowchart LR A[Test] --> B[Service] B --> C[Mock Repository] ``` This keeps tests stable and fast. > Next: API documentation with OpenAPI concept (so frontend teams can integrate easily).