code: def testHzToBark(self):
      hz = 440
      expected_bark = 26.81 * hz / (1960 + hz) - 0.53
      self.assertAlmostEqual(expected_bark, hz2bark(hz))
  
file_path: essentia/test/src/unittests/base/test_utils.py
imports: from essentia_test import *
  import math
  import cmath
  import sys
label_desc: Use image node_id 12 for calling the TestUtils obj's underlying member method code with example usage: obj.testHzToBark() without return types