code: def testAmpToDb(self):
      amp = 12.34
      expected_db = 20 * math.log10(amp)
      self.assertAlmostEqual(expected_db, amp2db(amp))
  
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 9 for calling the TestUtils obj's underlying member method code with example usage: obj.testAmpToDb() without return types