code: def test_settings_pickable(self):
      settings = PickableSettings()
      settings["test"] = 3
      settings[lambda x: x + 1] = None
  
      def f(x):
          return x - 2
  
      settings[f] = {"this": "is a test"}
  
      dumped_settings = pickle.dumps(settings)
      settings = pickle.loads(dumped_settings)
  
      self.assertIn("test", settings)
      self.assertEqual(len(settings), 3)
  
      for key in settings:
          self.assertTrue(
              not callable(key)
              or (key(3) == 4 and settings[key] is None)
              or (
                  key(3) == 1 and settings[key] == {"this": "is a test"}
              )
          )
  
imports: import pickle
  from unittest import TestCase
  import numpy
  import pandas
  from pandas.testing import assert_frame_equal
  from tsfresh.feature_extraction import feature_calculators
  from tsfresh.feature_extraction.extraction import extract_features
  from tsfresh.feature_extraction.settings import ComprehensiveFCParameters, EfficientFCParameters, IndexBasedFCParameters, MinimalFCParameters, PickableSettings, TimeBasedFCParameters, from_columns, include_function
label_desc: Use image node_id 1 for calling the TestSettingPickability obj's underlying member method code with example usage: obj.test_settings_pickable() and returns: unknown