code: def testEmpty(self):
      harmonicBpms = HarmonicBpm(bpm=100)([])
      self.assertEqualVector(harmonicBpms, [])
  
file_path: essentia/test/src/unittests/rhythm/test_harmonicbpm.py
imports: from essentia_test import *
  import essentia
label_desc: Use image node_id 1 for calling the TestHarmonicBpm obj's underlying member method code with example usage: obj.testEmpty() without return types