code: def test_melspectrogram(self):
      melspecgram = transforms.MelSpectrogram(
          center=True, pad_mode="reflect"
      )
      specgram = melspecgram.spectrogram
      self.assertEqual(specgram.center, True)
      self.assertEqual(specgram.pad_mode, "reflect")
  
imports: import math
  import torch
  import torchaudio
  import torchaudio.functional
  import torchaudio.transforms
  from torchaudio_unittest import common_utils
label_desc: Use image node_id 2 for calling the SmokeTest obj's underlying member method code with example usage: obj.test_melspectrogram() without return types