Add Windows-specific test for process creation to prevent hanging

Signed-off-by: DanielAvdar <[email protected]>

Author: DanielAvdar

tests/issues/test_552_windows_hang.py

@@ -0,0 +1,46 @@
+import asyncio
+import sys
+
+import pytest
+
+from mcp import StdioServerParameters
+from mcp.client.stdio import _create_platform_compatible_process
+
+
+@pytest.mark.skipif(sys.platform != "win32", reason="Windows-specific test")
+@pytest.mark.anyio
+async def test_windows_process_creation():
+    """
+    Test that directly tests the process creation function that was fixed in issue #552.
+    This simpler test verifies that Windows process creation works without hanging.
+    """
+    # Use a simple command that should complete quickly on Windows
+    params = StdioServerParameters(
+        command="cmd", args=["/c", "echo", "Test successful"]
+    )
+
+    # Directly test the fixed function that was causing the hanging issue
+    process = None
+    try:
+        # Set a timeout to prevent hanging
+        async with asyncio.timeout(3):
+            # Test the actual process creation function that was fixed
+            process = await _create_platform_compatible_process(
+                command=params.command, args=params.args, env=None
+            )
+
+            # If we get here without hanging, the test is successful
+            assert process is not None, "Process should be created successfully"
+
+            # Read from stdout to verify process works
+            if process.stdout:
+                output = await process.stdout.receive()
+                assert output, "Process should produce output"
+    finally:
+        # Clean up process
+        if process:
+            try:
+                process.terminate()
+            except Exception:
+                # Ignore errors during cleanup
+                pass