code: def testPinkReference(self):
      # Verifies that pink noise returns a 0 difference, since it is the
      # reference that we are using for this algorithm
      sampleRate = 44100
      pinkNoisePath = join(
          testdata.audio_dir,
          "generated",
          "synthesised",
          "noise_pink.wav",
      )
      input = MonoLoader(
          filename=pinkNoisePath, sampleRate=sampleRate
      )()
      replayGainDiff = ReplayGain(sampleRate=sampleRate)(input)
      self.assertAlmostEqual(replayGainDiff, 0.0, 0.1)
  
imports: from essentia_test import *
label_desc: Use image node_id 4 for calling the TestReplayGain obj's underlying member method code with example usage: obj.testPinkReference() without return types