code: def test_notes(self):
      # read a MIDI file
      midi = MIDIFile.from_file(
          pj(ANNOTATIONS_PATH, "stereo_sample.mid")
      )
      notes = np.loadtxt(pj(ANNOTATIONS_PATH, "stereo_sample.notes"))
      notes_ = midi.notes()[:, :4]
      self.assertTrue(np.allclose(notes, notes_, atol=1e-3))
  
imports: from __future__ import absolute_import, division, print_function
  import os
  import tempfile
  import unittest
  from os.path import join
  from madmom.utils.midi import *
  from .None import ANNOTATIONS_PATH
label_desc: Use image node_id 1 for calling the TestMIDIFileClass obj's underlying member method code with example usage: obj.test_notes() without return types