code: def test_audioclip_mono_max_volume(mono_wave):
      clip = AudioClip(mono_wave(440), duration=1, fps=44100)
      max_volume = clip.max_volume()
      assert isinstance(max_volume, float)
      assert max_volume > 0
  
file_path: moviepy/tests/test_AudioClips.py
imports: import os
  import numpy
  import pytest
  from moviepy.audio.AudioClip import AudioArrayClip, AudioClip, CompositeAudioClip, concatenate_audioclips
  from moviepy.audio.io.AudioFileClip import AudioFileClip
label_desc: Use image node_id 8 for calling a global function with example usage: test_audioclip_mono_max_volume(mono_wave) without return types