code: def test_request_included_with_chat_interface_when_streaming(self):
      def identity(x, y, request: gr.Request):
          assert isinstance(request.client.host, str)
          for i in range(len(x)):
              yield x[: i + 1]
  
      app, _, _ = (
          gr.ChatInterface(identity)
          .queue(api_open=True)
          .launch(
              prevent_thread_lock=True,
          )
      )
      client = TestClient(app)
  
      response = client.post(
          "/api/chat/", json={"data": ["test", None]}
      )
      assert response.status_code == 200
      output = dict(response.json())
      assert output["data"] == ["t", None]
  
imports: import functools
  import os
  import tempfile
  from contextlib import asynccontextmanager, closing
  from unittest import mock
  import gradio_client
  import numpy
  import pandas
  import pytest
  import starlette.routing
  from fastapi import FastAPI
  from fastapi.testclient import TestClient
  from gradio_client import media_data
  import gradio
  from gradio import Blocks, Button, Interface, Number, Textbox, close_all, routes, wasm_utils
  from gradio.route_utils import FnIndexInferError
label_desc: Use image node_id 3 for calling the TestPassingRequest obj's underlying member method code with example usage: obj.test_request_included_with_chat_interface_when_streaming() without return types