Migrate test_title.py to use Client and fix circular import

- Migrate tests/server/fastmcp/test_title.py to use Client.from_server()
- Fix circular import by not re-exporting ClientSessionGroup from client module
- Demonstrates cleaner API: no need to access ._mcp_server

Github-Issue:#1728

Author: felixweinberger

src/mcp/client/__init__.py

@@ -2,12 +2,10 @@
 
 from mcp.client.client import Client
 from mcp.client.session import ClientSession
-from mcp.client.session_group import ClientSessionGroup
 from mcp.client.transports.memory import create_in_memory_transport
 
 __all__ = [
     "Client",
     "ClientSession",
-    "ClientSessionGroup",
     "create_in_memory_transport",
 ]

tests/server/fastmcp/test_title.py

@@ -3,9 +3,9 @@
 import pytest
 from pydantic import AnyUrl
 
+from mcp import Client
 from mcp.server.fastmcp import FastMCP
 from mcp.server.fastmcp.resources import FunctionResource
-from mcp.shared.memory import create_connected_server_and_client_session
 from mcp.shared.metadata_utils import get_display_name
 from mcp.types import Prompt, Resource, ResourceTemplate, Tool, ToolAnnotations
 
@@ -25,8 +25,9 @@ async def test_server_name_title_description_version():
     assert mcp.version == "1.0"
 
     # Start server and connect client
-    async with create_connected_server_and_client_session(mcp._mcp_server) as client:
-        init_result = await client.initialize()
+    async with Client.from_server(mcp) as client:
+        # Access initialization result from session
+        init_result = await client.session.initialize()
         assert init_result.serverInfo.name == "TestServer"
         assert init_result.serverInfo.title == "Test Server Title"
         assert init_result.serverInfo.description == "This is a test server description."
@@ -61,9 +62,7 @@ def tool_with_both(message: str) -> str:  # pragma: no cover
         return message
 
     # Start server and connect client
-    async with create_connected_server_and_client_session(mcp._mcp_server) as client:
-        await client.initialize()
-
+    async with Client.from_server(mcp) as client:
         # List tools
         tools_result = await client.list_tools()
         tools = {tool.name: tool for tool in tools_result.tools}
@@ -105,9 +104,7 @@ def titled_prompt(topic: str) -> str:  # pragma: no cover
         return f"Tell me about {topic}"
 
     # Start server and connect client
-    async with create_connected_server_and_client_session(mcp._mcp_server) as client:
-        await client.initialize()
-
+    async with Client.from_server(mcp) as client:
         # List prompts
         prompts_result = await client.list_prompts()
         prompts = {prompt.name: prompt for prompt in prompts_result.prompts}
@@ -165,9 +162,7 @@ def titled_dynamic_resource(id: str) -> str:  # pragma: no cover
         return f"Data for {id}"
 
     # Start server and connect client
-    async with create_connected_server_and_client_session(mcp._mcp_server) as client:
-        await client.initialize()
-
+    async with Client.from_server(mcp) as client:
         # List resources
         resources_result = await client.list_resources()
         resources = {str(res.uri): res for res in resources_result.resources}