code: def test_error(self):
      with self.assertRaises(ValueError):
          sort_tempo([120, 60])
  
imports: from __future__ import absolute_import, division, print_function
  import math
  import unittest
  from madmom.evaluation.tempo import *
  from .None import ANNOTATIONS_PATH, DETECTIONS_PATH
label_desc: Use image node_id 2 for calling the TestSortTempoFunction obj's underlying member method code with example usage: obj.test_error() without return types