code: def testZero(self):
      n = 1000
      cm = CentralMoments(range=n - 1)
      ds = DistributionShape()
      self.assertEqualVector(ds(cm(zeros(n))), [0, 0, -3])
  
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestDistributionShape obj's underlying member method code with example usage: obj.testZero() without return types