docs/testing_strategy.md

# Testing Strategy

## Unit Tests
- Located in `tests/` directory.
- Use **FastAPI TestClient** (built on `requests`) and **pytest**.
- Coverage includes:
  - System stats (`/api/system`).
  - Engine flag persistence (`/api/engine/control`).
  - TTS preview with and without narration.
  - Story launch flow.

## Running Tests
```bash
pip install -r requirements.txt   # includes pytest
pytest -v
```

## CI Integration
- GitHub Actions workflow (`.github/workflows/ci.yml`) runs `pytest --cov=.` on every PR.
- Fails the build if coverage drops below 80 %.