code: def testOne(self):
      result = ChordsDescriptors()(["C"], "C", "major")
      self.assertEqualVector(result[0], [100] + [0] * 23)
      self.assertEqual(result[1], 1.0)  # chord rate
      self.assertEqual(result[2], 0.0)  # change rate
      self.assertEqual(result[3], "C")  # key
      self.assertEqual(result[4], "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 10 for calling the TestChordsDescriptors obj's underlying member method code with example usage: obj.testOne() without return types