code: def fixture_encode_aac():
      """fixture_encode_aac"""
      wav_path = os.path.join(
          os.path.dirname(os.path.abspath(__file__)),
          "test_audio",
          "gs-16b-2c-44100hz.wav",
      )
      value = tfio.audio.decode_wav(
          tf.io.read_file(wav_path), dtype=tf.int16
      )
      value = tf.cast(value, tf.float32) / 32768.0
  
      encoded_wav_path = os.path.join(
          os.path.dirname(os.path.abspath(__file__)),
          "test_audio",
          "gs-16b-2c-44100hz.encoded.ffmpeg.wav"
          if sys.platform == "linux"
          else "gs-16b-2c-44100hz.encoded.wav",
      )
      encoded_value = tfio.audio.decode_wav(
          tf.io.read_file(encoded_wav_path), dtype=tf.int16
      )
  
      # calculate the delta and expect a small diff
      args = value
  
      def func(e):
          delta = tf.constant(2.0, tf.float32)
          v = tfio.audio.encode_aac(e, rate=44100)
          v = tfio.audio.decode_aac(v)
          v = tf.cast(v * (1 << 15), tf.int16)
          v = tf.cast(v, tf.float32) - tf.cast(
              encoded_value, tf.float32
          )
          v = tf.math.logical_and(
              tf.math.less(v, delta), tf.math.greater(v, -delta)
          )
          return v
  
      expected = tf.ones_like(encoded_value, tf.bool)
  
      return args, func, expected
  
imports: import os
  import sys
  import pytest
  import numpy
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 25 for calling a global function with example usage: fixture_encode_aac() and returns: args,  func,  expected, v