code: def testConstantInput(self):
      # constant input reports bpm 0
      pool = self.computeBpmHistogram(ones(10 * 44100), minBpm=0)
      self.assertEqual(int(pool["bpm"]), 0)
      self.assertEqual(sum(pool["bpmCandidates"]), 0)
      self.assertEqual(sum(pool["bpmMagnitudes"]), 0)
  
file_path: essentia/test/src/unittests/rhythm/test_bpmhistogram.py
imports: from essentia_test import *
  import essentia
  from essentia import Pool
  from essentia.standard import *
  import essentia.streaming
  from math import ceil, fabs
  from numpy import argmax
label_desc: Use image node_id 5 for calling the TestBpmHistogram obj's underlying member method code with example usage: obj.testConstantInput() without return types