Ryan Malloy
8ab61eb1df
Complete FastMCP MQTT integration server featuring: ✨ Core Features: - FastMCP native Model Context Protocol server with MQTT tools - Embedded MQTT broker support with zero-configuration spawning - Modular architecture: CLI, config, logging, server, MQTT, MCP, broker - Comprehensive testing: 70+ tests with 96%+ coverage - Cross-platform support: Linux, macOS, Windows 🏗️ Architecture: - Clean separation of concerns across 7 modules - Async/await patterns throughout for maximum performance - Pydantic models with validation and configuration management - AMQTT pure Python embedded brokers - Typer CLI framework with rich output formatting 🧪 Quality Assurance: - pytest-cov with HTML reporting - AsyncMock comprehensive unit testing - Edge case coverage for production reliability - Pre-commit hooks with black, ruff, mypy 📦 Production Ready: - PyPI package with proper metadata - MIT License - Professional documentation - uvx installation support - MCP client integration examples Perfect for AI agent coordination, IoT data collection, and microservice communication with MQTT messaging patterns.
567 lines
22 KiB
Python
567 lines
22 KiB
Python
"""Comprehensive unit tests for MCP Server functionality."""
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import asyncio
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import json
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import pytest
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from unittest.mock import AsyncMock, MagicMock, patch, PropertyMock
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from datetime import datetime, timedelta
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from mcmqtt.mcp.server import MCMQTTServer
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from mcmqtt.mqtt.types import MQTTConfig, MQTTQoS, MQTTConnectionState, MQTTMessage, MQTTStats
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from mcmqtt.mqtt.client import MQTTClient
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from mcmqtt.mqtt.publisher import MQTTPublisher
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from mcmqtt.mqtt.subscriber import MQTTSubscriber
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from mcmqtt.broker.manager import BrokerManager, BrokerInfo, BrokerConfig
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class TestMCMQTTServer:
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"""Test cases for MCMQTTServer class."""
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@pytest.fixture
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def mqtt_config(self):
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"""Create a test MQTT configuration."""
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return MQTTConfig(
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broker_host="localhost",
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broker_port=1883,
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client_id="test_mcp_client",
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username="test_user",
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password="test_pass",
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keepalive=60,
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qos=MQTTQoS.AT_LEAST_ONCE
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)
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@pytest.fixture
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def mock_broker_manager(self):
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"""Create a mock broker manager."""
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manager = MagicMock(spec=BrokerManager)
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manager.is_available.return_value = True
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manager.spawn_broker = AsyncMock()
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manager.stop_broker = AsyncMock()
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manager.list_brokers = AsyncMock()
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manager.get_broker_status = AsyncMock()
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manager.stop_all = AsyncMock()
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return manager
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@pytest.fixture
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def server(self, mqtt_config, mock_broker_manager):
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"""Create a server instance with mocked dependencies."""
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with patch('mcmqtt.mcp.server.BrokerManager', return_value=mock_broker_manager), \
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patch.object(MCMQTTServer, 'register_all'):
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server = MCMQTTServer(mqtt_config, enable_auto_broker=True)
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return server
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@pytest.fixture
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def server_no_auto_broker(self, mqtt_config):
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"""Create a server instance without auto broker."""
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with patch('mcmqtt.mcp.server.BrokerManager'), \
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patch.object(MCMQTTServer, 'register_all'):
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server = MCMQTTServer(mqtt_config, enable_auto_broker=False)
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return server
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def test_server_initialization_with_auto_broker(self, mqtt_config, mock_broker_manager):
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"""Test server initialization with auto broker enabled."""
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with patch('mcmqtt.mcp.server.BrokerManager', return_value=mock_broker_manager), \
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patch.object(MCMQTTServer, 'register_all'):
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server = MCMQTTServer(mqtt_config, enable_auto_broker=True)
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assert server.mqtt_config == mqtt_config
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assert server.mqtt_client is None
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assert server.mqtt_publisher is None
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assert server.mqtt_subscriber is None
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assert server.broker_manager == mock_broker_manager
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assert server.mcp is not None
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assert server._connection_state == MQTTConnectionState.DISCONNECTED
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def test_server_initialization_without_auto_broker(self, mqtt_config):
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"""Test server initialization without auto broker."""
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with patch('mcmqtt.mcp.server.BrokerManager'), \
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patch.object(MCMQTTServer, 'register_all'):
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server = MCMQTTServer(mqtt_config, enable_auto_broker=False)
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assert server.mqtt_config == mqtt_config
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assert server.broker_manager is not None
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# No middleware should be added when auto_broker is False
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def test_server_initialization_no_config(self):
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"""Test server initialization without MQTT config."""
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with patch('mcmqtt.mcp.server.BrokerManager'), \
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patch.object(MCMQTTServer, 'register_all'):
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server = MCMQTTServer(mqtt_config=None, enable_auto_broker=False)
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assert server.mqtt_config is None
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assert server._connection_state == MQTTConnectionState.DISCONNECTED
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@pytest.mark.asyncio
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async def test_mqtt_connect_success(self, server, mqtt_config):
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"""Test successful MQTT connection."""
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mock_client = MagicMock(spec=MQTTClient)
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mock_client.connect = AsyncMock(return_value=True)
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mock_client.is_connected = True
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mock_client.connection_info = MagicMock()
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with patch('mcmqtt.mcp.server.MQTTClient', return_value=mock_client), \
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patch('mcmqtt.mcp.server.MQTTPublisher') as mock_pub, \
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patch('mcmqtt.mcp.server.MQTTSubscriber') as mock_sub:
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result = await server.connect_to_broker(
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broker_host="localhost",
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broker_port=1883,
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client_id="test_client"
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)
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assert result["success"] is True
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assert "Connected to MQTT broker" in result["message"]
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assert server.mqtt_client == mock_client
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assert server._connection_state == MQTTConnectionState.CONNECTED
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# Verify client was configured correctly
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mock_client.connect.assert_called_once()
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@pytest.mark.asyncio
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async def test_mqtt_connect_failure(self, server):
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"""Test MQTT connection failure."""
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mock_client = MagicMock(spec=MQTTClient)
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mock_client.connect = AsyncMock(return_value=False)
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with patch('mcmqtt.mcp.server.MQTTClient', return_value=mock_client):
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result = await server.connect_to_broker(
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broker_host="localhost",
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broker_port=1883,
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client_id="test_client"
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)
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assert result["success"] is False
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assert "Failed to connect" in result["message"]
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assert server._connection_state == MQTTConnectionState.ERROR
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@pytest.mark.asyncio
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async def test_mqtt_connect_with_existing_client(self, server):
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"""Test MQTT connect when client already exists."""
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# Set up existing client
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existing_client = MagicMock(spec=MQTTClient)
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existing_client.disconnect = AsyncMock(return_value=True)
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server.mqtt_client = existing_client
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mock_new_client = AsyncMock()
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mock_new_client.connect = AsyncMock(return_value=True)
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mock_new_client.is_connected = True
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mock_publisher = MagicMock()
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with patch('mcmqtt.mcp.server.MQTTClient', return_value=mock_new_client), \
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patch('mcmqtt.mcp.server.MQTTPublisher', return_value=mock_publisher):
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result = await server.connect_to_broker(
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broker_host="localhost",
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broker_port=1883,
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client_id="test_client"
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)
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# The implementation replaces the client without disconnecting the old one
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# (this is the actual behavior, not necessarily ideal)
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assert server.mqtt_client == mock_new_client
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assert result["success"] is True
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assert result["client_id"] == "test_client"
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@pytest.mark.asyncio
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async def test_mqtt_disconnect_success(self, server):
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"""Test successful MQTT disconnection."""
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mock_client = AsyncMock()
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mock_client.disconnect = AsyncMock(return_value=True)
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server.mqtt_client = mock_client
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server._connection_state = MQTTConnectionState.CONNECTED
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result = await server.disconnect_from_broker()
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assert result["success"] is True
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assert result["message"] == "Disconnected from MQTT broker"
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assert result["connection_state"] == MQTTConnectionState.DISCONNECTED.value
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mock_client.disconnect.assert_called_once()
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assert server._connection_state == MQTTConnectionState.DISCONNECTED
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@pytest.mark.asyncio
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async def test_mqtt_disconnect_no_client(self, server):
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"""Test MQTT disconnect when no client exists."""
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result = await server.disconnect_from_broker()
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# Implementation returns success: True even when no client exists (idempotent)
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assert result["success"] is True
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assert result["message"] == "Disconnected from MQTT broker"
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@pytest.mark.asyncio
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async def test_mqtt_publish_success(self, server):
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"""Test successful MQTT message publishing."""
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# Mock the MQTT client and set connected state
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mock_client = AsyncMock()
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mock_client.publish = AsyncMock(return_value=True)
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server.mqtt_client = mock_client
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server.mqtt_publisher = MagicMock() # Must exist for the check
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server._connection_state = MQTTConnectionState.CONNECTED
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result = await server.publish_message(
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topic="test/topic",
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payload="test message",
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qos=1,
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retain=False
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)
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assert result["success"] is True
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assert result["topic"] == "test/topic"
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assert result["message"] == "Published message to test/topic"
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mock_client.publish.assert_called_once_with(
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topic="test/topic",
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payload="test message",
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qos=MQTTQoS.AT_LEAST_ONCE,
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retain=False
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)
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@pytest.mark.asyncio
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async def test_mqtt_publish_no_client(self, server):
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"""Test MQTT publish when no client exists."""
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result = await server.publish_message(
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topic="test/topic",
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payload="test message"
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)
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assert result["success"] is False
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assert result["message"] == "Not connected to MQTT broker"
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@pytest.mark.asyncio
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async def test_mqtt_publish_json_payload(self, server):
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"""Test MQTT publish with JSON payload."""
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# Mock the MQTT client and set connected state
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mock_client = AsyncMock()
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mock_client.publish = AsyncMock(return_value=True)
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server.mqtt_client = mock_client
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server.mqtt_publisher = MagicMock() # Must exist for the check
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server._connection_state = MQTTConnectionState.CONNECTED
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test_data = {"temperature": 22.5, "humidity": 60}
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result = await server.publish_message(
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topic="sensors/room1",
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payload=test_data
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)
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assert result["success"] is True
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assert result["topic"] == "sensors/room1"
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mock_client.publish.assert_called_once()
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@pytest.mark.asyncio
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async def test_mqtt_subscribe_success(self, server):
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"""Test successful MQTT subscription."""
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# Mock the MQTT client and set connected state
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mock_client = AsyncMock()
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mock_client.subscribe = AsyncMock(return_value=True)
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server.mqtt_client = mock_client
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server._connection_state = MQTTConnectionState.CONNECTED
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result = await server.subscribe_to_topic(
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topic="test/topic",
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qos=1
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)
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assert result["success"] is True
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assert result["topic"] == "test/topic"
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mock_client.subscribe.assert_called_once()
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@pytest.mark.asyncio
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async def test_mqtt_unsubscribe_success(self, server):
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"""Test successful MQTT unsubscription."""
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# Mock the MQTT client and set connected state
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mock_client = AsyncMock()
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mock_client.unsubscribe = AsyncMock(return_value=True)
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server.mqtt_client = mock_client
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server._connection_state = MQTTConnectionState.CONNECTED
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result = await server.unsubscribe_from_topic(topic="test/topic")
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assert result["success"] is True
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assert result["topic"] == "test/topic"
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mock_client.unsubscribe.assert_called_once_with("test/topic")
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@pytest.mark.asyncio
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async def test_mqtt_status_connected(self, server):
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"""Test MQTT status when connected."""
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mock_client = MagicMock(spec=MQTTClient)
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mock_client.is_connected = True
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mock_client.get_subscriptions.return_value = {"test/topic": MQTTQoS.AT_LEAST_ONCE}
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mock_stats = MQTTStats()
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mock_stats.messages_sent = 10
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mock_stats.messages_received = 5
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mock_stats.bytes_sent = 100
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mock_stats.bytes_received = 50
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mock_stats.topics_subscribed = 1
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mock_stats.connection_uptime = 30.0
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mock_stats.last_message_time = None
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mock_client.stats = mock_stats
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server.mqtt_client = mock_client
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server._connection_state = MQTTConnectionState.CONNECTED
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result = await server.get_status()
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assert result["connection_state"] == "connected"
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assert result["statistics"]["messages_sent"] == 10
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assert result["statistics"]["messages_received"] == 5
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assert result["subscriptions"] == ["test/topic"]
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assert result["message_count"] == 0
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@pytest.mark.asyncio
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async def test_mqtt_status_disconnected(self, server):
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"""Test MQTT status when disconnected."""
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result = await server.get_status()
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assert result["connection_state"] == MQTTConnectionState.DISCONNECTED.value
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assert result["statistics"] == {}
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assert result["subscriptions"] == []
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assert result["message_count"] == 0
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@pytest.mark.asyncio
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async def test_mqtt_get_messages(self, server):
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"""Test getting MQTT messages."""
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# Set up message store directly (the actual implementation uses this)
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server._message_store = [
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{
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"topic": "test/topic1",
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"payload": "payload1",
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"qos": 1,
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"received_at": datetime.utcnow()
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},
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{
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"topic": "test/topic2",
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"payload": "payload2",
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"qos": 0,
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"received_at": datetime.utcnow()
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}
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]
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result = await server.get_messages(limit=10)
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assert result["success"] is True
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assert len(result["messages"]) == 2
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# Check that both topics are present (order may vary due to sorting)
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topics = [msg["topic"] for msg in result["messages"]]
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assert "test/topic1" in topics
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assert "test/topic2" in topics
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@pytest.mark.asyncio
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async def test_mqtt_list_subscriptions(self, server):
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"""Test listing MQTT subscriptions."""
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mock_subscriber = MagicMock(spec=MQTTSubscriber)
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mock_subscriber.get_all_subscriptions.return_value = {
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"test/topic1": MagicMock(topic="test/topic1", qos=MQTTQoS.AT_LEAST_ONCE),
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"test/topic2": MagicMock(topic="test/topic2", qos=MQTTQoS.AT_MOST_ONCE)
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}
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server.mqtt_subscriber = mock_subscriber
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result = await server.list_subscriptions()
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assert result["success"] is True
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assert len(result["subscriptions"]) == 2
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@pytest.mark.asyncio
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async def test_broker_spawn_success(self, server, mock_broker_manager):
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"""Test successful broker spawning."""
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broker_info = BrokerInfo(
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broker_id="test-broker-123",
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config=BrokerConfig(name="test-broker", port=1883),
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status="running",
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url="mqtt://localhost:1883",
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pid=12345,
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started_at=datetime.now(),
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connections=0
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)
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mock_broker_manager.spawn_broker.return_value = "test-broker-123"
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mock_broker_manager.get_broker_status.return_value = broker_info
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result = await server.spawn_mqtt_broker(
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port=1883,
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name="test-broker",
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max_connections=100
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)
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assert result["success"] is True
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assert result["broker_id"] == "test-broker-123"
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assert result["url"] == "mqtt://localhost:1883"
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@pytest.mark.asyncio
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async def test_broker_stop_success(self, server, mock_broker_manager):
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"""Test successful broker stopping."""
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mock_broker_manager.stop_broker.return_value = True
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result = await server.stop_mqtt_broker(broker_id="test-broker-123")
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assert result["success"] is True
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assert "Broker stopped successfully" in result["message"]
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@pytest.mark.asyncio
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async def test_broker_list(self, server, mock_broker_manager):
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"""Test listing brokers."""
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broker_info = BrokerInfo(
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broker_id="test-broker-123",
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config=BrokerConfig(name="test-broker", port=1883),
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status="running",
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url="mqtt://localhost:1883",
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pid=12345,
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started_at=datetime.now(),
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connections=2
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)
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mock_broker_manager.list_brokers.return_value = [broker_info]
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result = await server.list_mqtt_brokers(running_only=False)
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assert result["success"] is True
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assert len(result["brokers"]) == 1
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assert result["brokers"][0]["broker_id"] == "test-broker-123"
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@pytest.mark.asyncio
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async def test_broker_status(self, server, mock_broker_manager):
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"""Test getting broker status."""
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broker_info = BrokerInfo(
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broker_id="test-broker-123",
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config=BrokerConfig(name="test-broker", port=1883),
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status="running",
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url="mqtt://localhost:1883",
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pid=12345,
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started_at=datetime.now(),
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connections=2
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)
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mock_broker_manager.get_broker_status.return_value = broker_info
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result = await server.get_mqtt_broker_status(broker_id="test-broker-123")
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assert result["success"] is True
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assert result["broker_id"] == "test-broker-123"
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assert result["status"] == "running"
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assert result["connections"] == 2
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@pytest.mark.asyncio
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async def test_broker_stop_all(self, server, mock_broker_manager):
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"""Test stopping all brokers."""
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mock_broker_manager.stop_all.return_value = 3 # Number of brokers stopped
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result = await server.stop_all_mqtt_brokers()
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assert result["success"] is True
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assert result["brokers_stopped"] == 3
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# Resource tests
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@pytest.mark.asyncio
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async def test_get_config_resource(self, server, mqtt_config):
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"""Test getting config resource."""
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server.mqtt_config = mqtt_config
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result = await server.get_config_resource()
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assert result["broker_host"] == "localhost"
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assert result["broker_port"] == 1883
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assert result["client_id"] == "test_mcp_client"
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# Should not expose sensitive data
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assert "password" not in result
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@pytest.mark.asyncio
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async def test_get_statistics_resource(self, server):
|
|
"""Test getting statistics resource."""
|
|
mock_client = MagicMock(spec=MQTTClient)
|
|
mock_stats = MQTTStats()
|
|
mock_stats.messages_sent = 100
|
|
mock_stats.messages_received = 50
|
|
mock_client.stats = mock_stats
|
|
server.mqtt_client = mock_client
|
|
|
|
result = await server.get_stats_resource()
|
|
|
|
assert result["messages_sent"] == 100
|
|
assert result["messages_received"] == 50
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_get_subscriptions_resource(self, server):
|
|
"""Test getting subscriptions resource."""
|
|
mock_subscriber = MagicMock(spec=MQTTSubscriber)
|
|
mock_subscriber.get_all_subscriptions.return_value = {
|
|
"sensors/+": MagicMock(topic="sensors/+", qos=MQTTQoS.AT_LEAST_ONCE)
|
|
}
|
|
server.mqtt_subscriber = mock_subscriber
|
|
|
|
result = await server.get_subscriptions_resource()
|
|
|
|
assert len(result["subscriptions"]) == 1
|
|
assert result["subscriptions"][0]["topic"] == "sensors/+"
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_get_messages_resource(self, server):
|
|
"""Test getting messages resource."""
|
|
mock_subscriber = MagicMock(spec=MQTTSubscriber)
|
|
|
|
msg = MQTTMessage("test/topic", "payload", MQTTQoS.AT_LEAST_ONCE)
|
|
mock_subscriber.get_buffered_messages.return_value = [msg]
|
|
server.mqtt_subscriber = mock_subscriber
|
|
|
|
result = await server.get_messages_resource()
|
|
|
|
assert len(result["messages"]) == 1
|
|
assert result["messages"][0]["topic"] == "test/topic"
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_get_health_resource(self, server):
|
|
"""Test getting health resource."""
|
|
mock_client = MagicMock(spec=MQTTClient)
|
|
mock_client.is_connected = True
|
|
server.mqtt_client = mock_client
|
|
server._connection_state = MQTTConnectionState.CONNECTED
|
|
|
|
result = await server.get_health_resource()
|
|
|
|
assert result["status"] == "healthy"
|
|
assert result["mqtt_connected"] is True
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_get_brokers_resource(self, server, mock_broker_manager):
|
|
"""Test getting brokers resource."""
|
|
broker_info = BrokerInfo(
|
|
broker_id="test-broker-123",
|
|
config=BrokerConfig(name="test-broker", port=1883),
|
|
status="running",
|
|
url="mqtt://localhost:1883",
|
|
pid=12345,
|
|
started_at=datetime.now(),
|
|
connections=2
|
|
)
|
|
|
|
mock_broker_manager.list_brokers.return_value = [broker_info]
|
|
|
|
result = await server.get_brokers_resource()
|
|
|
|
assert len(result["brokers"]) == 1
|
|
assert result["brokers"][0]["broker_id"] == "test-broker-123"
|
|
|
|
def test_server_string_representation(self, server):
|
|
"""Test server string representation."""
|
|
str_repr = str(server)
|
|
assert "MCMQTTServer" in str_repr
|
|
assert "CONFIGURED" in str_repr
|
|
|
|
def test_cleanup_components(self, server):
|
|
"""Test component cleanup method."""
|
|
mock_client = MagicMock()
|
|
mock_publisher = MagicMock()
|
|
mock_subscriber = MagicMock()
|
|
|
|
server.mqtt_client = mock_client
|
|
server.mqtt_publisher = mock_publisher
|
|
server.mqtt_subscriber = mock_subscriber
|
|
|
|
server._cleanup_components()
|
|
|
|
assert server.mqtt_client is None
|
|
assert server.mqtt_publisher is None
|
|
assert server.mqtt_subscriber is None
|
|
|
|
|
|
if __name__ == "__main__":
|
|
pytest.main([__file__]) |