code: def testNegatives(self):
      input = [3, 7, -45, 2, -1, 0]
      self.assertComputeFails(PowerMean(), input)
      self.assertComputeFails(PowerMean(power=0), input)
  
file_path: essentia/test/src/unittests/stats/test_powermean.py
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestPowerMean obj's underlying member method code with example usage: obj.testNegatives() without return types