code: def testOne(self):
      input = [0]
      self.assertAlmostEqual(Loudness()(input), 0)
  
      input = [100]
      self.assertAlmostEqual(
          Loudness()(input), 478.63009232263852, 1e-6
      )
  
imports: from essentia_test import *
label_desc: Use image node_id 3 for calling the TestLoudness obj's underlying member method code with example usage: obj.testOne() without return types