code: def test_merge_func(self):
      merged_chords = merge_chords(DUMMY_DUPL_ANNOTATIONS)
      self.assertTrue(
          (merged_chords == DUMMY_MERGED_DUPL_ANNOTATIONS).all()
      )
  
imports: from __future__ import absolute_import, division, print_function
  import unittest
  from os.path import join
  from madmom.evaluation.chords import *
  from .None import ANNOTATIONS_PATH, DETECTIONS_PATH
label_desc: Use image node_id 11 for calling the TestChordParsing obj's underlying member method code with example usage: obj.test_merge_func() without return types