code: def test_characteristics_downloaded_robot_execution_failures(self):
      self.assertEqual(len(self.data), 7352)
      self.assertIsInstance(self.data, DataFrame)
  
      self.assertEqual(len(self.classes), 7352)
      self.assertIsInstance(self.classes, Series)
  
file_path: tsfresh/tests/integrations/examples/test_har_dataset.py
imports: import shutil
  import tempfile
  from unittest import TestCase
  from pandas import DataFrame, Series
  from tsfresh.examples.har_dataset import download_har_dataset, load_har_classes, load_har_dataset
label_desc: Use image node_id 3 for calling the HumanActivityTestCase obj's underlying member method code with example usage: obj.test_characteristics_downloaded_robot_execution_failures() without return types