code: def test_encodes_mono_wav(self):
      self._check_wav(
          self._encode(self._mono, samples_per_second=44100)
      )
  
file_path: tensorboard/tensorboard/util/encoder_test.py
imports: import numpy
  import tensorflow
  from tensorboard.util import encoder
label_desc: Use image node_id 3 for calling the TensorFlowWavEncoderTest obj's underlying member method code with example usage: obj.test_encodes_mono_wav() without return types