code: def testEmpty(self):
      beats = []
      start, stop, n = BpmRubato()(beats)
      self.assertEqualVector(start, [])
      self.assertEqualVector(stop, [])
      self.assertEqual(n, 0)
  
file_path: essentia/test/src/unittests/rhythm/test_bpmrubato.py
imports: from essentia_test import *
label_desc: Use image node_id 8 for calling the TestBpmRubato obj's underlying member method code with example usage: obj.testEmpty() without return types