code: def test_notes(self):
      # read a MIDI file
      midi = MIDIFile(pj(ANNOTATIONS_PATH, "stereo_sample.mid"))
      notes = np.loadtxt(pj(ANNOTATIONS_PATH, "stereo_sample.notes"))
      self.assertTrue(np.allclose(notes, midi.notes[:, :4], 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.io.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