code: def testZero(self):
      pcp = zeros([10, 12])
      gen = VectorInput(pcp)
      chordsDetection = ChordsDetection(windowSize=2.0, hopSize=2048)
      pool = Pool()
  
      gen.data >> chordsDetection.pcp
      chordsDetection.chords >> (pool, "chords.progression")
      chordsDetection.strength >> (pool, "chords.strength")
      run(gen)
  
      self.assertEqualVector(
          pool["chords.progression"], ["Am"] * len(pcp)
      )
      self.assertEqualVector(pool["chords.strength"], [-1] * len(pcp))
  
file_path: essentia/test/src/unittests/tonal/test_chordsdetection_streaming.py
imports: from essentia_test import *
  from essentia.streaming import ChordsDetection
label_desc: Use image node_id 8 for calling the TestChordsDetection_Streaming obj's underlying member method code with example usage: obj.testZero() without return types