code: def test_calculate_rms_stereo(self):
      np.random.seed(42)
      sample_len = 1024
      samples_in = np.random.uniform(
          low=-0.5, high=0.5, size=(2, sample_len)
      ).astype(np.float32)
      rms = calculate_rms(samples_in)
      assert rms == pytest.approx(0.287, abs=0.01)
  
file_path: audiomentations/tests/test_utils.py
imports: import os
  import numpy
  import pytest
  from audiomentations.core.utils import calculate_desired_noise_rms, convert_decibels_to_amplitude_ratio, find_audio_files_in_paths, calculate_rms, calculate_rms_without_silence
  from demo.demo import DEMO_DIR
label_desc: Use image node_id 7 for calling the TestUtils obj's underlying member method code with example usage: obj.test_calculate_rms_stereo() without return types