diff --git a/tests/protocols/test_websocket.py b/tests/protocols/test_websocket.py
index 366a4f0bdb..23ce96c50b 100644
--- a/tests/protocols/test_websocket.py
+++ b/tests/protocols/test_websocket.py
@@ -732,6 +732,7 @@ async def test_server_can_read_messages_in_buffer_after_close(
 ):
     frames = []
     client_close_connection = asyncio.Event()
+    disconnect_message = {}
 
     class App(WebSocketResponse):
         async def websocket_connect(self, message):
@@ -741,6 +742,10 @@ async def websocket_connect(self, message):
             # read these frames
             await client_close_connection.wait()
 
+        async def websocket_disconnect(self, message):
+            nonlocal disconnect_message
+            disconnect_message = message
+
         async def websocket_receive(self, message):
             frames.append(message.get("bytes"))
 
@@ -753,9 +758,11 @@ async def send_text(url):
     config = Config(app=App, ws=ws_protocol_cls, http=http_protocol_cls, lifespan="off")
     async with run_server(config):
         await send_text("ws://127.0.0.1:8000")
+        await asyncio.sleep(0.1)
         client_close_connection.set()
 
     assert frames == [b"abc", b"abc", b"abc"]
+    assert disconnect_message == {"type": "websocket.disconnect", "code": 1000}
 
 
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