How to integration unit test for ClientWebSocket?

Question

I want to create an integration test that sends data to server and gets the response from ClientWebSocket.

[Fact]
public async Task WebSocket_Sending()
{
    
    var client = new ClientWebSocket();
    await client.ConnectAsync(Uri, CancellationToken.None);

    var sending = client.SendAsync(data, WebSocketMessageType.Binary, CancellationToken.None);

    var response = ????
    
    Assert.AreEqual(response, "response");
}

But the web socket communication is not a send/receive mechanism. So I could not find a way to test the results. How can I do this?