code: def test_calculate_desired_noise_rms(self):
      noise_rms = calculate_desired_noise_rms(clean_rms=0.5, snr=6)
      assert noise_rms == pytest.approx(0.2505936168136362)
  
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 1 for calling the TestUtils obj's underlying member method code with example usage: obj.test_calculate_desired_noise_rms() without return types