code: def fixture_encode_wav_u8():
      """fixture_encode_wav_u8"""
      wav_path = os.path.join(
          os.path.dirname(os.path.abspath(__file__)),
          "test_audio",
          "ZASFX_ADSR_no_sustain.wav",
      )
      audio = tf.audio.decode_wav(tf.io.read_file(wav_path))
      value = audio.audio
      value = (value + 1.0) / 2.0 * 256.0
      value = tf.cast(value, tf.uint8)
  
      args = value
  
      def func(e):
          v = tfio.audio.encode_wav(e, rate=44100)
          return tfio.audio.decode_wav(v, dtype=tf.uint8)
  
      expected = value
  
      return args, func, expected
  
imports: import os
  import sys
  import pytest
  import numpy
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 9 for calling a global function with example usage: fixture_encode_wav_u8() and returns: args,  func,  expected, tfio