code: def testZero(self):
      result = Mean()([0] * 10)
      self.assertAlmostEqual(result, 0)
  
file_path: essentia/test/src/unittests/stats/test_mean.py
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestMean obj's underlying member method code with example usage: obj.testZero() without return types