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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
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1 changed files with 1298 additions and 526 deletions
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16
tests/client/test_sampling_callback.py
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@ -1,11 +1,9 @@
import pytest
from mcp import Client
from mcp.client.session import ClientSession
from mcp.server.fastmcp import FastMCP
from mcp.shared.context import RequestContext
from mcp.shared.memory import (
create_connected_server_and_client_session as create_session,
)
from mcp.types import (
CreateMessageRequestParams,
CreateMessageResult,
@ -43,17 +41,17 @@ async def test_sampling_callback():
return True
# Test with sampling callback
async with create_session(server._mcp_server, sampling_callback=sampling_callback) as client_session:
async with Client(server, sampling_callback=sampling_callback) as client:
# Make a request to trigger sampling callback
result = await client_session.call_tool("test_sampling", {"message": "Test message for sampling"})
result = await client.call_tool("test_sampling", {"message": "Test message for sampling"})
assert result.is_error is False
assert isinstance(result.content[0], TextContent)
assert result.content[0].text == "true"
# Test without sampling callback
async with create_session(server._mcp_server) as client_session:
async with Client(server) as client:
# Make a request to trigger sampling callback
result = await client_session.call_tool("test_sampling", {"message": "Test message for sampling"})
result = await client.call_tool("test_sampling", {"message": "Test message for sampling"})
assert result.is_error is True
assert isinstance(result.content[0], TextContent)
assert result.content[0].text == "Error executing tool test_sampling: Sampling not supported"
@ -94,8 +92,8 @@ async def test_create_message_backwards_compat_single_content():
assert not hasattr(result, "content_as_list") or not callable(getattr(result, "content_as_list", None))
return True
async with create_session(server._mcp_server, sampling_callback=sampling_callback) as client_session:
result = await client_session.call_tool("test_backwards_compat", {"message": "Test"})
async with Client(server, sampling_callback=sampling_callback) as client:
result = await client.call_tool("test_backwards_compat", {"message": "Test"})
assert result.is_error is False
assert isinstance(result.content[0], TextContent)
assert result.content[0].text == "true"