code: def test_default_adapter(adapter):
      """Test adapter as default adapter."""
      assert isinstance(adapter, FFMPEGProcessAudioAdapter)
      assert adapter is AudioAdapter._DEFAULT
  
file_path: spleeter/tests/test_ffmpeg_adapter.py
imports: from os.path import join
  from tempfile import TemporaryDirectory
  import ffmpeg
  import numpy
  from pytest import fixture, raises
  from spleeter import SpleeterError
  from spleeter.audio.adapter import AudioAdapter
  from spleeter.audio.ffmpeg import FFMPEGProcessAudioAdapter
label_desc: Use image node_id 3 for calling a global function with example usage: test_default_adapter(adapter) without return types