code: def setUp(self):
      self.decorator = downmix_to_mono
      # Decorate the process
      FakeAnalyzer.decorated_process = self.decorator(
          FakeAnalyzer.process
      )
      self.blocksize = 1024
      self.stepsize = 256
  
imports: import unittest
  from unit_timeside import TestRunner
  from timeside.core.preprocessors import downmix_to_mono, frames_adapter
  import numpy
  from numpy.testing import assert_array_equal
label_desc: Use image node_id 1 for calling the TestDownmixToMono obj's underlying member method code with example usage: obj.setUp() without return types