Add xfail test for issue #5180 (#9055)

tests/test_web_websocket_functional.py

@@ -1150,3 +1150,23 @@ async def on_shutdown(app: web.Application) -> None:
     assert reply.extra == "Server shutdown"
 
     assert websocket.closed is True
+
+
+@pytest.mark.xfail(reason="close never reaches client per issue #5180")
+async def test_ws_close_return_code(aiohttp_client: AiohttpClient) -> None:
+    """Test that the close code is returned when the server closes the connection."""
+
+    async def handler(request: web.Request) -> web.WebSocketResponse:
+        ws = web.WebSocketResponse()
+        await ws.prepare(request)
+        await ws.close()
+        return ws
+
+    app = web.Application()
+    app.router.add_route("GET", "/", handler)
+    client = await aiohttp_client(app)
+    resp = await client.ws_connect("/")
+    await resp.send_str("some data")
+    await asyncio.sleep(0.1)
+    await resp.receive()
+    assert resp.close_code is WSCloseCode.OK