# TraceRTM Test Infrastructure

## 🎉 Status: FULLY OPERATIONAL

After 15+ hours of intensive debugging and implementation, we have a **production-ready test infrastructure** with the latest tools and best practices.

---

## 📦 Technology Stack

### Core Testing Framework
- **pytest 9.0.1** (Latest stable, released 2025)
- **pytest-asyncio 1.3.0** (Latest, with Mode.AUTO support)
- **pytest-cov 7.0.0** (Latest coverage plugin)
- **pytest-mock 3.15.0** (Latest mocking support)
- **pytest-xdist 3.8.0** (Parallel test execution)
- **pytest-benchmark 5.2.3** (Performance testing)

### Database & ORM
- **SQLAlchemy 2.0.44** (Latest with full async support)
- **aiosqlite 0.21.0** (Async SQLite driver)
- **greenlet 3.2.0** (Required for SQLAlchemy async)
- **alembic 1.17.0** (Database migrations)

### Additional Tools
- **hypothesis 6.148.0** (Property-based testing)
- **faker 38.0.0** (Test data generation)
- **factory-boy 3.3.0** (Test fixtures)

---

## 🏗️ Test Architecture

### Fixture Structure

```python
# tests/conftest.py

@pytest_asyncio.fixture(scope="function")
async def db_connection():
    """Single database connection per test."""
    engine = create_async_engine(
        "sqlite+aiosqlite:///:memory:",
        poolclass=StaticPool,  # Critical for in-memory DB
    )
    async with engine.connect() as conn:
        await conn.run_sync(Base.metadata.create_all)
        await conn.commit()
        yield conn
        await conn.run_sync(Base.metadata.drop_all)
    await engine.dispose()

@pytest_asyncio.fixture
async def db_session(db_connection):
    """Transactional session per test."""
    async with db_connection.begin():
        session = AsyncSession(bind=db_connection, expire_on_commit=False)
        yield session
        await session.rollback()
```

### Key Design Decisions

1. **StaticPool for SQLite**: Ensures single connection for in-memory database
2. **Function-scoped fixtures**: Clean state for each test
3. **Automatic rollback**: Tests don't affect each other
4. **Async-first**: All fixtures and tests use async/await

---

## ✅ Current Test Coverage

### Repository Tests (20 tests, 100% passing)

#### ItemRepository (7 tests)
```python
✅ test_create_item              # Basic CRUD
✅ test_get_by_id                # Retrieval
✅ test_get_by_id_not_found      # Error handling
✅ test_update_item              # Updates
✅ test_update_optimistic_locking # Concurrency control
✅ test_delete_item              # Soft delete
✅ test_list_by_project          # Queries
```

#### ProjectRepository (5 tests)
```python
✅ test_create_project           # Basic CRUD
✅ test_get_by_id                # Retrieval
✅ test_get_by_name              # Unique constraint
✅ test_update_project           # Updates
✅ test_get_all_projects         # List all
```

#### LinkRepository (4 tests)
```python
✅ test_create_link              # Link creation
✅ test_get_by_id                # Retrieval
✅ test_get_links_for_item       # Traceability
✅ test_delete_link              # Cleanup
```

#### EventRepository (4 tests)
```python
✅ test_log_event                # Event sourcing
✅ test_get_by_entity            # Event history
✅ test_get_by_project           # Project events
✅ test_get_by_agent             # Agent tracking
```

### Coverage Report
```
Name                                    Stmts   Miss   Cover
------------------------------------------------------------
repositories/__init__.py                   6      0  100.00%
repositories/event_repository.py          41     13   54.90%
repositories/item_repository.py           60     14   70.51%
repositories/link_repository.py           32      6   81.25%
repositories/project_repository.py        36      2   86.36%
repositories/agent_repository.py          28     15   46.43%
------------------------------------------------------------
TOTAL                                    203     50   69.46%
```

---

## 🚀 Running Tests

### Basic Commands
```bash
# Run all tests
pytest

# Run with coverage
pytest --cov=src/tracertm --cov-report=term-missing

# Run specific test file
pytest tests/unit/repositories/test_item_repository.py

# Run with verbose output
pytest -v

# Run in parallel (4 workers)
pytest -n 4

# Run with benchmarks
pytest --benchmark-only
```

### Test Markers
```bash
# Run only unit tests
pytest -m unit

# Run only integration tests
pytest -m integration

# Run only async tests
pytest -m asyncio

# Run slow tests
pytest -m slow
```

---

## 🔧 Configuration

### pyproject.toml
```toml
[tool.pytest.ini_options]
testpaths = ["tests"]
python_files = ["test_*.py", "*_test.py"]
python_classes = ["Test*"]
python_functions = ["test_*"]
addopts = [
    "-ra",
    "-vv",
    "--strict-markers",
    "--tb=short",
]
markers = [
    "unit: Unit tests (fast, no external dependencies)",
    "integration: Integration tests (database, file system)",
    "e2e: End-to-end tests (full CLI workflows)",
    "slow: Slow tests (>1s execution time)",
    "agent: Agent coordination tests (concurrent operations)",
    "asyncio: Async tests with pytest-asyncio",
]
asyncio_mode = "auto"
```

---

## 📝 Writing Tests

### Example Test
```python
import pytest
from sqlalchemy.ext.asyncio import AsyncSession
from tracertm.repositories.item_repository import ItemRepository

@pytest.mark.unit
@pytest.mark.asyncio
async def test_create_item(db_session: AsyncSession):
    """Test creating an item."""
    repo = ItemRepository(db_session)
    
    item = await repo.create(
        project_id="proj-1",
        title="Test Feature",
        view="FEATURE",
        item_type="feature",
        status="todo",
    )
    
    assert item.id is not None
    assert item.title == "Test Feature"
    assert item.version == 1
```

---

## 🎯 Next Steps

1. **Increase coverage to 90%+**
   - Add edge case tests
   - Test error conditions
   - Add concurrent operation tests

2. **Add integration tests**
   - Multi-repository operations
   - Transaction rollback scenarios
   - Performance benchmarks

3. **Add E2E tests**
   - CLI command tests
   - Full workflow tests
   - Agent coordination tests

4. **CI/CD Integration**
   - GitHub Actions workflow
   - Automated coverage reporting
   - Performance regression detection

