code: def testZero(self):
      self.assertEqual(Flatness()(zeros(1000)), 0)
  
file_path: essentia/test/src/unittests/stats/test_flatness.py
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestFlatness obj's underlying member method code with example usage: obj.testZero() without return types