code: def testEmpty(self):
      # empty input should return no onsets (empty array)
      self.assertEqualVector(SuperFluxExtractor()([]), [])
  
file_path: essentia/test/src/unittests/rhythm/test_superfluxextractor.py
imports: from essentia_test import *
  from essentia.standard import MonoLoader, SuperFluxExtractor
  from numpy import *
label_desc: Use image node_id 6 for calling the TestSuperFluxExtractor obj's underlying member method code with example usage: obj.testEmpty() without return types