code: def testEmpty(self):
      with self.assertRaises(EssentiaException):
          ChordsDetectionBeats()(
              np.zeros(shape=(0, 12), dtype=np.single),
              np.zeros(shape=(0,), dtype=np.single),
          )
  
      with self.assertRaises(EssentiaException):
          ChordsDetectionBeats()(
              np.random.rand(100, 12).astype(dtype=np.single),
              np.zeros(shape=(0,), dtype=np.single),
          )
  
      chords, strength = ChordsDetectionBeats()(
          np.zeros(shape=(0, 12), dtype=np.single),
          [0.75 * i for i in range(10)],
      )
      self.assertEqual(len(chords), 0)
  
imports: from essentia_test import *
  import numpy
label_desc: Use image node_id 1 for calling the TestChordsDetectionBeats obj's underlying member method code with example usage: obj.testEmpty() without return types