code: def testEmpty(self):
      hpcp = HPCP()([], [])
      self.assertEqualVector(hpcp, [0.0] * 12)
  
file_path: essentia/test/src/unittests/spectral/test_hpcp.py
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestHPCP obj's underlying member method code with example usage: obj.testEmpty() without return types