code: def testRegression(self):
      spectrum = readVector(
          filename=join(filedir(), "energybandratio", "input.txt")
      )
      expected = readValue(
          filename=join(filedir(), "energybandratio", "output.txt")
      )
  
      ebr = EnergyBandRatio(
          startFrequency=0.0, stopFrequency=100.0, sampleRate=44100
      )
  
      self.assertAlmostEqual(ebr(spectrum), expected)
  
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestEnergyBandRatio obj's underlying member method code with example usage: obj.testRegression() without return types