code: def setUp(self):
      self.e1 = NoteOnEvent(tick=100, pitch=50, velocity=60)
      self.e2 = NoteOffEvent(tick=300, pitch=50)
      self.e3 = NoteOffEvent(tick=200, pitch=50)
      self.e4 = NoteOnEvent(tick=300, pitch=50, velocity=60)
  
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 TestEventsClass obj's underlying member method code with example usage: obj.setUp() without return types