# Testcontainers Setup Complete

**Date:** 2026-02-12  
**Epic:** Epic 3 Action Item  
**Status:** ✅ COMPLETE

---

## Summary

The testcontainers integration test infrastructure has been fully implemented, addressing the CRITICAL blocker identified in the Epic 3 retrospective. This setup enables end-to-end testing with real RabbitMQ instances.

## What Was Implemented

### 1. Centralized Testcontainers Fixtures (`tests/conftest.py`)

Added comprehensive session and function-scoped fixtures:

- **`docker_available()`** - Checks if Docker is running
- **`rabbitmq_container_session()`** - Session-scoped RabbitMQ 3.13 container
- **`rabbitmq_container()`** - Function-scoped alias with test isolation
- **`rabbitmq_settings()`** - Pre-configured Settings object for container
- **`http_client_manager()`** - HTTP client connected to container
- **`amqp_connection()`** - AMQP connection manager for container

### 2. Features

✅ **Automatic Docker Detection** - Tests skip gracefully if Docker unavailable  
✅ **Session Reuse** - Container started once per session for performance  
✅ **Test Isolation** - Each test uses unique resource names  
✅ **RabbitMQ 3.13** - Latest RabbitMQ with Management Plugin  
✅ **Both Protocols** - HTTP Management API and AMQP support  
✅ **Clean Teardown** - Automatic container cleanup  
✅ **CI/CD Ready** - Works in GitHub Actions with Docker support

### 3. Usage Examples

#### Basic Integration Test

```python
import pytest

@pytest.mark.integration
def test_queue_operations(rabbitmq_container):
    """Test with testcontainer fixture."""
    host = rabbitmq_container.get_container_host_ip()
    port = int(rabbitmq_container.get_exposed_port(15672))
    # ... test code ...
```

#### Using Pre-configured Settings

```python
@pytest.mark.integration
def test_with_settings(rabbitmq_settings):
    """Test with pre-configured Settings object."""
    from rabbitmq_mcp_connection.operations.topology import ListQueuesOperation
    
    operation = ListQueuesOperation(http_client, rabbitmq_settings)
    result = await operation.execute(vhost="/")
    assert result is not None
```

#### Using HTTP Client Manager

```python
@pytest.mark.asyncio
@pytest.mark.integration
async def test_http_operations(http_client_manager):
    """Test with HTTP client manager."""
    response = await http_client_manager.get("/api/queues")
    assert response.status_code == 200
```

#### Using AMQP Connection

```python
@pytest.mark.asyncio
@pytest.mark.integration
async def test_amqp_operations(amqp_connection):
    """Test with AMQP connection."""
    channel = await amqp_connection.get_channel()
    # ... publish/consume messages ...
```

## Running Integration Tests

```bash
# Run all integration tests
uv run pytest tests/integration/ -m integration -v

# Run specific test file
uv run pytest tests/integration/test_queue_operations.py -m integration -v

# Skip integration tests (requires Docker)
uv run pytest tests/ -m "not integration"

# Run in CI/CD (Docker available in GitHub Actions)
uv run pytest tests/integration/ -m integration --maxfail=1
```

## Existing Integration Tests

The following test suites already use testcontainers:

### Connection & Infrastructure
- `tests/integration/rabbitmq_mcp_connection/test_connection_integration.py`
- `tests/integration/rabbitmq_mcp_connection/test_http_client_integration.py`
- `tests/integration/rabbitmq_mcp_connection/test_health_integration.py`

### Topology Operations (Epic 3)
- `tests/integration/test_queue_operations.py`
- `tests/integration/test_exchange_operations.py`
- `tests/integration/test_binding_operations.py`
- `tests/integration/test_delete_exchange_operation_new.py`
- `tests/integration/test_vhost_validation_integration.py`
- `tests/integration/test_list_queues_integration.py`

### Tools & Server
- `tests/integration/rabbitmq_mcp_connection/test_call_id_tool.py`
- `tests/integration/test_get_id_tool_integration.py`
- `tests/integration/test_server_startup.py`

### Other
- `tests/integration/test_async_logging.py`
- `tests/integration/test_performance.py`
- `tests/integration/test_schema_compatibility.py`

## CI/CD Integration

### GitHub Actions Support

GitHub Actions provides Docker by default. Integration tests run automatically:

```yaml
# .github/workflows/ci.yml
- name: Run integration tests
  run: |
    uv run pytest tests/integration/ -m integration -v --maxfail=1
```

### Dev Container Support

The devcontainer configuration includes Docker-in-Docker support:

```json
{
  "mounts": [
    "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind"
  ]
}
```

This allows running integration tests inside the devcontainer.

## Performance Considerations

### Container Startup Time
- **First test:** ~15-20 seconds (container pull + startup)
- **Subsequent tests:** 0 seconds (session reuse)
- **Total overhead:** ~20 seconds per test session

### Optimization Strategies
1. **Session scope** - Container reused across all tests
2. **Test isolation** - Use unique names instead of cleanup
3. **Parallel execution** - Use `pytest-xdist` for parallel test runs
4. **Local caching** - Docker images cached locally after first pull

## Next Steps

### Epic 4 Requirements

✅ **Ready for Epic 4** - Message Publishing & Consumption integration tests can now use:
- `rabbitmq_container` fixture for real RabbitMQ
- `amqp_connection` fixture for message publishing
- `http_client_manager` fixture for management operations

### Mandatory for Epic 4

Per Epic 3 retrospective:
> "Make integration tests mandatory in Epic 4 - Do NOT defer integration tests for message publishing/consumption operations (higher risk than topology)"

**Action:** All Epic 4 stories MUST include integration tests using testcontainers fixtures.

## References

- **Epic 3 Retrospective:** docs-bmad/sprint-artifacts/epic-3-retro-2026-02-12.md
- **ADR-010:** pytest + testcontainers (docs-bmad/architecture/architecture-decision-records-adrs.md)
- **Test Design System:** docs-bmad/test-design-system.md
- **Testcontainers Docs:** https://testcontainers-python.readthedocs.io/

## Resolution

This addresses the **CRITICAL blocker** from Epic 3 retrospective:

> "Setup testcontainers for integration tests (BLOCKER - cannot defer again)"

**Status:** ✅ **RESOLVED**

The testcontainers infrastructure is now production-ready and available for all Epic 4 development.

---

**Implemented By:** Dev Agent (GitHub Copilot)  
**Reviewed By:** Bob (Scrum Master)  
**Approved By:** Alice (Product Owner)
