code: def get_tuner_class(*args, **kwargs):
      pipeline = mock.Mock()
      pipeline.transform_x.side_effect = lambda x: x
      tuner = mock.Mock()
      tuner.get_best_pipeline.return_value = pipeline
      tuner_class = mock.Mock()
      tuner_class.return_value = tuner
      return tuner_class
  
imports: from unittest import mock
  import keras_tuner
  import numpy
  import pytest
  import tensorflow
  import autokeras
  from autokeras import test_utils
label_desc: Use image node_id 1 for calling a global function with example usage: get_tuner_class() and returns: tuner_class