code: def testRegression(self):
      # Simple regression test, comparing to reference values
      input = readVector(
          join(filedir(), "highfrequencycontent/input.txt")
      )
      expected = readVector(
          join(filedir(), "highfrequencycontent/output.txt")
      )
      self.assertAlmostEqual(
          HFC(sampleRate=44100, type="Masri")(input), expected[0], 1e-6
      )
      self.assertAlmostEqual(
          HFC(sampleRate=44100, type="Jensen")(input), expected[1], 1e-6
      )
      self.assertAlmostEqual(
          HFC(sampleRate=44100, type="Brossier")(input),
          expected[2],
          1e-6,
      )
  
file_path: essentia/test/src/unittests/spectral/test_hfc.py
imports: from essentia_test import *
  from essentia import *
label_desc: Use image node_id 1 for calling the TestHFC obj's underlying member method code with example usage: obj.testRegression() without return types