code: def test_caching_audio(self, patched_cache_folder):
      io = gr.Interface(
          lambda x: x,
          "audio",
          "audio",
          examples=[["test/test_files/audio_sample.wav"]],
          cache_examples=True,
      )
      prediction = io.examples_handler.load_from_cache(0)
      file = prediction[0].path
      assert client_utils.encode_url_or_file_to_base64(file).startswith(
          "data:audio/wav;base64,UklGRgA/"
      )
  
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 4 for calling the TestProcessExamples obj's underlying member method code with example usage: obj.test_caching_audio(patched_cache_folder) without return types