code: def test_wav_to_mel(self):
      mel_basis = np_transforms.build_mel_basis(**self.config)
      mel = np_transforms.wav_to_mel(
          wav=self.sample_wav, mel_basis=mel_basis, **self.config
      )
      self.assertEqual(
          mel.shape,
          (
              self.config.num_mels,
              math.ceil(
                  self.sample_wav.shape[0] / self.config.hop_length
              ),
          ),
      )
  
imports: import math
  import os
  import unittest
  from dataclasses import dataclass
  import librosa
  import numpy
  from coqpit import Coqpit
  from tests import get_tests_input_path, get_tests_output_path, get_tests_path
  from TTS.utils.audio import numpy_transforms
label_desc: Use image node_id 9 for calling the TestNumpyTransforms obj's underlying member method code with example usage: obj.test_wav_to_mel() without return types