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Add ergonomic Client class for testing MCP servers (#1870)

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Felix Weinberger 2026-01-16 15:49:26 +00:00 • committed by GitHub
commit df039bf97c
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1 changed files with 1298 additions and 526 deletions
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6
tests/issues/test_188_concurrency.py
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@ -2,8 +2,8 @@ import anyio
import pytest
from pydantic import AnyUrl
from mcp import Client
from mcp.server.fastmcp import FastMCP
from mcp.shared.memory import create_connected_server_and_client_session as create_session
@pytest.mark.anyio
@ -30,7 +30,7 @@ async def test_messages_are_executed_concurrently_tools():
call_order.append("trigger_end")
return "slow"
async with create_session(server._mcp_server) as client_session:
async with Client(server) as client_session:
# First tool will wait on event, second will set it
async with anyio.create_task_group() as tg:
# Start the tool first (it will wait on event)
@ -70,7 +70,7 @@ async def test_messages_are_executed_concurrently_tools_and_resources():
call_order.append("resource_end")
return "slow"
async with create_session(server._mcp_server) as client_session:
async with Client(server) as client_session:
# First tool will wait on event, second will set it
async with anyio.create_task_group() as tg:
# Start the tool first (it will wait on event)