code: def testDbToLin(self):
      db = -45.5
      expected_lin = 10 ** (db / 10.0)
      self.assertAlmostEqual(expected_lin, db2lin(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 6 for calling the TestUtils obj's underlying member method code with example usage: obj.testDbToLin() without return types