attempt to get server to shut down

tests/shared/test_sse.py

@@ -1,5 +1,6 @@
 # test_sse.py
 import re
+import socket
 import time
 import json
 import anyio
@@ -25,13 +26,9 @@ SERVER_NAME = "test_server_for_SSE"
 
 @pytest.fixture
 def server_port() -> int:
-    import socket
-
-    s = socket.socket()
-    s.bind(('', 0))
-    port = s.getsockname()[1]
-    s.close()
-    return port
+    with socket.socket() as s:
+        s.bind(('127.0.0.1', 0))
+        return s.getsockname()[1]
 
 @pytest.fixture
 def server_url(server_port: int) -> str:
@@ -89,6 +86,12 @@ async def server_app()-> Starlette:
 
     return app
 
+@pytest.fixture(autouse=True)
+def space_around_test():
+    time.sleep(0.1)
+    yield
+    time.sleep(0.1)
+
 @pytest.fixture()
 def server(server_app: Starlette, server_port: int):
     server = uvicorn.Server(config=uvicorn.Config(app=server_app, host="127.0.0.1", port=server_port, log_level="error"))
@@ -99,9 +102,27 @@ def server(server_app: Starlette, server_port: int):
     while not server.started:
         print('waiting for server to start')
         time.sleep(0.5)
+
+    try:
         yield
+    finally:
         print('killing server')
-    server_thread.join(timeout=0.1)
+        # Signal the server to stop
+        server.should_exit = True
+
+        # Force close the server's main socket
+        if hasattr(server.servers, "servers"):
+            for s in server.servers:
+                print(f'closing {s}')
+                s.close()
+
+        # Wait for thread to finish
+        server_thread.join(timeout=2)
+        if server_thread.is_alive():
+            print("Warning: Server thread did not exit cleanly")
+            # Optionally, you could add more aggressive cleanup here
+            import _thread
+            _thread.interrupt_main()
 
 @pytest.fixture()
 async def http_client(server, server_url) -> AsyncGenerator[httpx.AsyncClient, None]:
@@ -167,3 +188,6 @@ async def test_sse_client_exception_handling(initialized_sse_client_session: Cli
     session = initialized_sse_client_session
     with pytest.raises(McpError, match="OOPS! no resource with that URI was found"):
         await session.read_resource(uri=AnyUrl("xxx://will-not-work"))
+
+
+# TODO: test that timeouts are respected and that the error comes back