code: def testUnknownChord(self):
      chords = [
          "Cb",
          "G",
          "C",
          "G",
          "C",
          "G",
      ]  # Cb will raise exception
      self.assertComputeFails(ChordsDescriptors(), chords, "C", "major")
  
file_path: essentia/test/src/unittests/tonal/test_chordsdescriptors.py
imports: from essentia_test import *
  from essentia.streaming import ChordsDescriptors
label_desc: Use image node_id 6 for calling the TestChordsDescriptors obj's underlying member method code with example usage: obj.testUnknownChord() without return types