code: def setUpClass(self):
      random = np.random.RandomState(1234)
      self.noise1 = random.normal(
          loc=500, scale=100, size=16000
      ).astype("int16")
      self.sample_rate1 = 16000
      self.noise2 = random.normal(
          loc=500, scale=100, size=48000
      ).astype("int16")
      self.sample_rate2 = 48000
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from .util import TempDirectory
  from copy import copy
  import math
  from os import mkdir
  import unittest
  import pytest
  import numpy
  import sys
  import turicreate
  from turicreate.toolkits._internal_utils import _raise_error_if_not_sarray
  from turicreate.toolkits._main import ToolkitError
  from turicreate.toolkits._internal_utils import _mac_ver
label_desc: Use image node_id 1 for calling the ReadAudioTest obj's underlying member method code with example usage: obj.setUpClass() without return types