code: def test30Sec(self):
      input = [randint(0, 100) for x in range(44100 * 30)]
      self.assertAlmostEqual(Duration()(input), 30.0)
  
file_path: essentia/test/src/unittests/temporal/test_duration.py
imports: from essentia_test import *
  import essentia.streaming
  from random import randint
label_desc: Use image node_id 4 for calling the TestDuration obj's underlying member method code with example usage: obj.test30Sec() without return types