code: def testDbToPow(self):
      db = -45.5
      expected_pow = 10 ** (db / 10.0)
      self.assertAlmostEqual(expected_pow, db2pow(db), 5e-7)
  
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 8 for calling the TestUtils obj's underlying member method code with example usage: obj.testDbToPow() without return types