code: def test_convert_to_16_bit_wav(self):
      # Generate a random audio sample and set the amplitude
      audio = np.random.randint(-100, 100, size=(100), dtype="int16")
      audio[0] = -32767
      audio[1] = 32766
  
      audio_ = audio.astype("float64")
      audio_ = processing_utils.convert_to_16_bit_wav(audio_)
      assert np.allclose(audio, audio_)
      assert audio_.dtype == "int16"
  
      audio_ = audio.astype("float32")
      audio_ = processing_utils.convert_to_16_bit_wav(audio_)
      assert np.allclose(audio, audio_)
      assert audio_.dtype == "int16"
  
      audio_ = processing_utils.convert_to_16_bit_wav(audio)
      assert np.allclose(audio, audio_)
      assert audio_.dtype == "int16"
  
imports: import os
  import shutil
  import tempfile
  from copy import deepcopy
  from pathlib import Path
  from unittest.mock import patch
  import ffmpy
  import numpy
  import pytest
  from gradio_client import media_data
  from PIL import Image, ImageCms
  from gradio import processing_utils, utils
label_desc: Use image node_id 3 for calling the TestAudioPreprocessing obj's underlying member method code with example usage: obj.test_convert_to_16_bit_wav() without return types