Apply review feedback: use anyio.fail_after and simplify exception handling

- Replace asyncio.timeout with anyio.fail_after for consistency
- Simplify exception handling logic
- Uncomment Windows-specific test skip condition
- Auto-format code with ruff

Author: felixweinberger

tests/issues/test_552_windows_hang.py

@@ -1,13 +1,13 @@
-import asyncio
 import sys
 
+import anyio
 import pytest
 
 from mcp import ClientSession, StdioServerParameters
 from mcp.client.stdio import stdio_client
 
-# @pytest.mark.skipif(sys.platform != "win32", reason="Windows-specific test")
-@pytest.mark.skipif(sys.version_info < (3, 11), reason="asyncio.timeout in 3.11+")
+
+@pytest.mark.skipif(sys.platform != "win32", reason="Windows-specific test")
 @pytest.mark.parametrize(
     "args",
     [
@@ -32,19 +32,18 @@ async def test_windows_process_creation(args):
     # Directly test the fixed function that was causing the hanging issue
     try:
         # Set a timeout to prevent hanging
-        async with asyncio.timeout(5):
+        with anyio.fail_after(5):
             # Test the actual process creation function that was fixed
             async with stdio_client(params) as (read, write):
                 print("inside client")
                 async with ClientSession(read, write) as c:
                     print("inside ClientSession")
                     await c.initialize()
-
-    except asyncio.TimeoutError:
+    except TimeoutError:
         pytest.xfail("Process creation timed out, indicating a hang issue")
-    except ProcessLookupError:
-        pytest.xfail("Process creation failed with ProcessLookupError")
     except Exception as e:
-        assert "ExceptionGroup" in repr(e), f"Unexpected error: {e}"
-        assert "ProcessLookupError" in repr(e), f"Unexpected error: {e}"
-        pytest.xfail(f"Expected error: {e}")
+        # Simplified exception handling - check for expected errors
+        if "ProcessLookupError" in repr(e):
+            pytest.xfail(f"Expected error: {e}")
+        else:
+            raise