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refactor: use Client class in tests (#1900)

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Felix Weinberger 2026-01-17 08:46:58 +00:00 • committed by GitHub
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1 changed files with 163 additions and 227 deletions
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116
tests/shared/test_session.py
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@ -4,7 +4,7 @@ import anyio
import pytest
import mcp.types as types
from mcp.client._memory import InMemoryTransport
from mcp import Client
from mcp.client.session import ClientSession
from mcp.server.lowlevel.server import Server
from mcp.shared.exceptions import McpError
@ -25,68 +25,55 @@ from mcp.types import (
)
@pytest.fixture
def mcp_server() -> Server:
return Server(name="test server")
@pytest.mark.anyio
async def test_in_flight_requests_cleared_after_completion(mcp_server: Server):
async def test_in_flight_requests_cleared_after_completion():
"""Verify that _in_flight is empty after all requests complete."""
transport = InMemoryTransport(mcp_server)
async with transport.connect() as (read_stream, write_stream):
async with ClientSession(read_stream=read_stream, write_stream=write_stream) as session:
await session.initialize()
server = Server(name="test server")
async with Client(server) as client:
# Send a request and wait for response
response = await client.send_ping()
assert isinstance(response, EmptyResult)
# Send a request and wait for response
response = await session.send_ping()
assert isinstance(response, EmptyResult)
# Verify _in_flight is empty
assert len(session._in_flight) == 0
# Verify _in_flight is empty
assert len(client.session._in_flight) == 0
@pytest.mark.anyio
async def test_request_cancellation():
"""Test that requests can be cancelled while in-flight."""
# The tool is already registered in the fixture
ev_tool_called = anyio.Event()
ev_cancelled = anyio.Event()
request_id = None
# Start the request in a separate task so we can cancel it
def make_server() -> Server:
server = Server(name="TestSessionServer")
# Create a server with a slow tool
server = Server(name="TestSessionServer")
# Register the tool handler
@server.call_tool()
async def handle_call_tool(name: str, arguments: dict[str, Any] | None) -> list[TextContent]:
nonlocal request_id, ev_tool_called
if name == "slow_tool":
request_id = server.request_context.request_id
ev_tool_called.set()
await anyio.sleep(10) # Long enough to ensure we can cancel
return [] # pragma: no cover
raise ValueError(f"Unknown tool: {name}") # pragma: no cover
# Register the tool handler
@server.call_tool()
async def handle_call_tool(name: str, arguments: dict[str, Any] | None) -> list[TextContent]:
nonlocal request_id, ev_tool_called
if name == "slow_tool":
request_id = server.request_context.request_id
ev_tool_called.set()
await anyio.sleep(10) # Long enough to ensure we can cancel
return [] # pragma: no cover
raise ValueError(f"Unknown tool: {name}") # pragma: no cover
# Register the tool so it shows up in list_tools
@server.list_tools()
async def handle_list_tools() -> list[types.Tool]:
return [
types.Tool(
name="slow_tool",
description="A slow tool that takes 10 seconds to complete",
input_schema={},
)
]
# Register the tool so it shows up in list_tools
@server.list_tools()
async def handle_list_tools() -> list[types.Tool]:
return [
types.Tool(
name="slow_tool",
description="A slow tool that takes 10 seconds to complete",
input_schema={},
)
]
return server
async def make_request(session: ClientSession):
async def make_request(client: Client):
nonlocal ev_cancelled
try:
await session.send_request(
await client.session.send_request(
ClientRequest(
types.CallToolRequest(
params=types.CallToolRequestParams(name="slow_tool", arguments={}),
@ -100,31 +87,28 @@ async def test_request_cancellation():
assert "Request cancelled" in str(e)
ev_cancelled.set()
transport = InMemoryTransport(make_server())
async with transport.connect() as (read_stream, write_stream):
async with ClientSession(read_stream=read_stream, write_stream=write_stream) as session:
await session.initialize()
async with anyio.create_task_group() as tg: # pragma: no branch
tg.start_soon(make_request, session)
async with Client(server) as client:
async with anyio.create_task_group() as tg: # pragma: no branch
tg.start_soon(make_request, client)
# Wait for the request to be in-flight
with anyio.fail_after(1): # Timeout after 1 second
await ev_tool_called.wait()
# Wait for the request to be in-flight
with anyio.fail_after(1): # Timeout after 1 second
await ev_tool_called.wait()
# Send cancellation notification
assert request_id is not None
await session.send_notification(
ClientNotification(
CancelledNotification(
params=CancelledNotificationParams(request_id=request_id),
)
# Send cancellation notification
assert request_id is not None
await client.session.send_notification(
ClientNotification(
CancelledNotification(
params=CancelledNotificationParams(request_id=request_id),
)
)
)
# Give cancellation time to process
# TODO(Marcelo): Drop the pragma once https://github.com/coveragepy/coveragepy/issues/1987 is fixed.
with anyio.fail_after(1): # pragma: no cover
await ev_cancelled.wait()
# Give cancellation time to process
# TODO(Marcelo): Drop the pragma once https://github.com/coveragepy/coveragepy/issues/1987 is fixed.
with anyio.fail_after(1): # pragma: no cover
await ev_cancelled.wait()
@pytest.mark.anyio