code: def testWav44100(self):
      # files with 9 impulses in each channel
      filename = join(wav_dir, "impulses_1second_44100_st.wav")
      left = self.load(filename, "left", 44100)
      right = self.load(filename, "right", 44100)
      mix = self.load(filename, "mix", 44100)
      self.assertEqual(self.round(sum(left)), 9)
      self.assertEqual(self.round(sum(right)), 9)
      self.assertEqual(self.round(sum(mix)), 9)
  
imports: from essentia_test import *
  from numpy import fabs
label_desc: Use image node_id 4 for calling the TestMonoLoader obj's underlying member method code with example usage: obj.testWav44100() without return types