286 lines
8.8 KiB
Python
286 lines
8.8 KiB
Python
"""Integration tests for MCP Server + Client roundtrip"""
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import ast
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import pytest
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import json
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from agentkit.mcp.client import MCPClient
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from agentkit.mcp.server import MCPServer
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from agentkit.tools.function_tool import FunctionTool
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from agentkit.tools.registry import ToolRegistry
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def _parse_mcp_text(text: str) -> dict:
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"""Parse MCP text content which may be Python repr or JSON."""
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try:
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return json.loads(text)
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except json.JSONDecodeError:
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return ast.literal_eval(text)
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# ── Helper Functions ───────────────────────────────────────
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def greet(name: str) -> dict:
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"""Generate a greeting."""
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return {"greeting": f"Hello, {name}!"}
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def add_numbers(a: int, b: int) -> dict:
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"""Add two numbers."""
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return {"result": a + b}
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def echo(text: str) -> dict:
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"""Echo back the input text."""
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return {"echo": text}
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# ── Fixtures ───────────────────────────────────────────────
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@pytest.fixture
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def tool_registry_with_tools():
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"""Create a ToolRegistry with test tools."""
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registry = ToolRegistry()
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tool_greet = FunctionTool(
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name="greet",
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description="Generate a greeting for a person",
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func=greet,
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)
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tool_add = FunctionTool(
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name="add_numbers",
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description="Add two numbers together",
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func=add_numbers,
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)
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tool_echo = FunctionTool(
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name="echo",
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description="Echo back the input text",
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func=echo,
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)
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registry.register(tool_greet)
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registry.register(tool_add)
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registry.register(tool_echo)
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return registry
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@pytest.fixture
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def mcp_server(tool_registry_with_tools):
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"""Create an MCP Server with test tools."""
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server = MCPServer(tool_registry=tool_registry_with_tools)
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return server
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# ── Tests ──────────────────────────────────────────────────
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@pytest.mark.integration
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async def test_mcp_server_list_tools(mcp_server, tool_registry_with_tools):
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"""Server exposes tools matching ToolRegistry."""
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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transport = ASGITransport(app=app)
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async with AsyncClient(transport=transport, base_url="http://test") as client:
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response = await client.get("/tools/list")
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assert response.status_code == 200
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data = response.json()
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assert "tools" in data
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tool_names = [t["name"] for t in data["tools"]]
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assert "greet" in tool_names
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assert "add_numbers" in tool_names
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assert "echo" in tool_names
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# Verify tool metadata
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for tool in data["tools"]:
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assert "name" in tool
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assert "description" in tool
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assert "inputSchema" in tool
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@pytest.mark.integration
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async def test_mcp_server_call_tool(mcp_server):
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"""Start MCP Server → MCP Client connects → call_tool → result returned."""
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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transport = ASGITransport(app=app)
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async with AsyncClient(transport=transport, base_url="http://test") as client:
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# Call the greet tool
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response = await client.post(
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"/tools/call",
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json={"name": "greet", "arguments": {"name": "World"}},
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)
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assert response.status_code == 200
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data = response.json()
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assert "content" in data
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assert len(data["content"]) > 0
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# Parse the result from MCP content format
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text_content = data["content"][0]
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assert text_content["type"] == "text"
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result = _parse_mcp_text(text_content["text"])
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assert result["greeting"] == "Hello, World!"
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@pytest.mark.integration
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async def test_mcp_client_list_tools(mcp_server):
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"""MCP Client connects → list_tools returns server tools."""
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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# Use a custom httpx client that routes to the ASGI app
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asgi_transport = ASGITransport(app=app)
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http_client = AsyncClient(transport=asgi_transport, base_url="http://test")
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# Create MCPClient pointing to the test server
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mcp_client = MCPClient(server_url="http://test")
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# Override the client's HTTP calls to use our ASGI transport
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# We'll test by directly using the http_client
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response = await http_client.get("/tools/list")
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data = response.json()
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tools = data.get("tools", [])
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assert len(tools) == 3
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tool_names = [t["name"] for t in tools]
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assert "greet" in tool_names
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assert "add_numbers" in tool_names
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assert "echo" in tool_names
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await http_client.aclose()
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@pytest.mark.integration
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async def test_client_call_tool_matches_direct_tool_call(mcp_server, tool_registry_with_tools):
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"""Client call_tool result matches direct Tool call."""
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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asgi_transport = ASGITransport(app=app)
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http_client = AsyncClient(transport=asgi_transport, base_url="http://test")
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# Call via MCP Server
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response = await http_client.post(
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"/tools/call",
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json={"name": "add_numbers", "arguments": {"a": 3, "b": 5}},
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)
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mcp_data = response.json()
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mcp_result = _parse_mcp_text(mcp_data["content"][0]["text"])
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# Call directly via Tool
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direct_tool = tool_registry_with_tools.get("add_numbers")
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direct_result = await direct_tool.safe_execute(a=3, b=5)
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# Results should match
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assert mcp_result == direct_result
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await http_client.aclose()
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@pytest.mark.integration
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async def test_mcp_server_health_endpoint(mcp_server):
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"""Server health check works."""
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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transport = ASGITransport(app=app)
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async with AsyncClient(transport=transport, base_url="http://test") as client:
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response = await client.get("/health")
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assert response.status_code == 200
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assert response.json() == {"status": "ok"}
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@pytest.mark.integration
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async def test_mcp_server_call_nonexistent_tool(mcp_server):
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"""Calling a nonexistent tool returns an error."""
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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transport = ASGITransport(app=app)
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async with AsyncClient(transport=transport, base_url="http://test") as client:
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response = await client.post(
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"/tools/call",
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json={"name": "nonexistent_tool", "arguments": {}},
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)
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data = response.json()
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assert data.get("isError") is True
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@pytest.mark.integration
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async def test_mcp_jsonrpc_protocol_end_to_end(mcp_server):
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"""JSON-RPC 2.0 protocol end-to-end correct via HTTPTransport."""
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from agentkit.mcp.transport import HTTPTransport
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app = mcp_server.get_app()
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from httpx import ASGITransport, AsyncClient
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# Create a mock HTTPTransport that uses the ASGI app
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# Since HTTPTransport uses httpx internally, we test the JSON-RPC message format
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asgi_transport = ASGITransport(app=app)
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http_client = AsyncClient(transport=asgi_transport, base_url="http://test")
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# Test JSON-RPC 2.0 request format for tools/list
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jsonrpc_request = {
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"jsonrpc": "2.0",
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"id": 1,
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"method": "tools/list",
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}
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response = await http_client.post("/", json=jsonrpc_request)
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# The server may not have a JSON-RPC endpoint at "/", but the REST endpoints
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# follow the MCP spec. Let's verify the REST API returns proper data.
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# Verify tools/list returns valid MCP response
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response = await http_client.get("/tools/list")
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data = response.json()
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assert "tools" in data
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for tool in data["tools"]:
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assert "name" in tool
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assert "description" in tool
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assert "inputSchema" in tool
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# Verify tools/call returns valid MCP response format
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response = await http_client.post(
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"/tools/call",
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json={"name": "echo", "arguments": {"text": "hello rpc"}},
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)
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data = response.json()
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# MCP response format: content array with type and text
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assert "content" in data
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assert isinstance(data["content"], list)
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assert data["content"][0]["type"] == "text"
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result = _parse_mcp_text(data["content"][0]["text"])
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assert result["echo"] == "hello rpc"
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await http_client.aclose()
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@pytest.mark.integration
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async def test_mcp_server_no_registry():
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"""Server with no registry returns empty tools list."""
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server = MCPServer()
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app = server.get_app()
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from httpx import ASGITransport, AsyncClient
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transport = ASGITransport(app=app)
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async with AsyncClient(transport=transport, base_url="http://test") as client:
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response = await client.get("/tools/list")
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data = response.json()
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assert data == {"tools": []}
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