code: def test_preprocessor_import_shortcuts():
      """Tests if all pre-processors have shortcuts added to the preprocessors/__init__.py"""
  
      # iterate preprocessors
      for processor in all_classes_of_module(preprocessors_module):
          assert hasattr(preprocessors, processor.__name__)
  
imports: from maze import preprocessors
  from maze.core.wrappers.observation_preprocessing import preprocessors
  from maze.test.shared_test_utils.helper_functions import all_classes_of_module
label_desc: Use image node_id 1 for calling a global function with example usage: test_preprocessor_import_shortcuts() without return types