code: def test_end_to_end(self, patched_cache_folder):
      def concatenate(str1, str2):
          return str1 + str2
  
      with gr.Blocks() as demo:
          t1 = gr.Textbox()
          t2 = gr.Textbox()
          t1.submit(concatenate, [t1, t2], t2)
  
          gr.Examples(
              [["Hello,", None], ["Michael", None]],
              inputs=[t1, t2],
              api_name="load_example",
          )
  
      app, _, _ = demo.launch(prevent_thread_lock=True)
      client = TestClient(app)
  
      response = client.post("/api/load_example/", json={"data": [0]})
      assert response.json()["data"] == [
          {
              "lines": 1,
              "max_lines": 20,
              "show_label": True,
              "container": True,
              "min_width": 160,
              "autofocus": False,
              "autoscroll": True,
              "elem_classes": [],
              "rtl": False,
              "show_copy_button": False,
              "__type__": "update",
              "visible": True,
              "value": "Hello,",
              "type": "text",
          }
      ]
  
      response = client.post("/api/load_example/", json={"data": [1]})
      assert response.json()["data"] == [
          {
              "lines": 1,
              "max_lines": 20,
              "show_label": True,
              "container": True,
              "min_width": 160,
              "autofocus": False,
              "autoscroll": True,
              "elem_classes": [],
              "rtl": False,
              "show_copy_button": False,
              "__type__": "update",
              "visible": True,
              "value": "Michael",
              "type": "text",
          }
      ]
  
imports: import asyncio
  import json
  import os
  import shutil
  import subprocess
  import tempfile
  import time
  from pathlib import Path
  from unittest.mock import patch
  import gradio_client
  import pytest
  from gradio_client import media_data
  from gradio_client import utils
  from pydub import AudioSegment
  from starlette.testclient import TestClient
  from tqdm import tqdm
  import gradio
  from gradio import utils
label_desc: Use image node_id 15 for calling the TestProcessExamples obj's underlying member method code with example usage: obj.test_end_to_end(patched_cache_folder) and returns: unknown