code: def test_empty_spectrogram(self):
      spec = np.zeros(shape=(0, 0), dtype=np.float32)
      transform = SpecChannelShuffle(p=1.0)
      augmented_spectrogram = transform(spec)
  
      np.testing.assert_array_equal(spec, augmented_spectrogram)
  
file_path: audiomentations/tests/test_spec_channel_shuffle.py
imports: import os
  import pytest
  import librosa
  import numpy
  from audiomentations import SpecChannelShuffle
  from audiomentations.core.audio_loading_utils import load_sound_file
  from audiomentations.core.transforms_interface import MonoAudioNotSupportedException
  from demo.demo import DEMO_DIR
  from .utils import plot_matrix
label_desc: Use image node_id 3 for calling the TestSpecChannelShuffle obj's underlying member method code with example usage: obj.test_empty_spectrogram() without return types