code: def test_noise_transform(self):
      np.random.seed(3650)
      random.seed(3650)
      samples = np.sin(np.linspace(0, 440 * 2 * np.pi, 22500)).astype(
          np.float32
      )
      sample_rate = 44100
      augmenter = AddBackgroundNoise(
          sounds_path=os.path.join(DEMO_DIR, "background_noises"),
          min_snr_db=3,
          max_snr_db=6,
          p=1.0,
      )
      samples_out_without_transform = augmenter(
          samples=samples, sample_rate=sample_rate
      )
      augmenter.freeze_parameters()
      augmenter.noise_transform = Reverse()
      samples_out_with_transform = augmenter(
          samples=samples, sample_rate=sample_rate
      )
  
      assert not np.allclose(
          samples_out_without_transform, samples_out_with_transform
      )
  
file_path: audiomentations/tests/test_add_background_noise.py
imports: import json
  import os
  import pickle
  import random
  import warnings
  import numpy
  import pytest
  from audiomentations import AddBackgroundNoise, Compose, Reverse
  from demo.demo import DEMO_DIR
label_desc: Use image node_id 9 for calling the TestAddBackgroundNoise obj's underlying member method code with example usage: obj.test_noise_transform() without return types