code: def test_api_functions():
      expected_exposed_functions = [
          "flip_axis",
          "random_rotation",
          "random_shift",
          "random_shear",
          "random_zoom",
          "apply_channel_shift",
          "random_channel_shift",
          "apply_brightness_shift",
          "random_brightness",
          "transform_matrix_offset_center",
          "apply_affine_transform",
          "validate_filename",
          "save_img",
          "load_img",
          "list_pictures",
          "array_to_img",
          "img_to_array",
      ]
      for function in expected_exposed_functions:
          assert hasattr(image, function)
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_api_functions() without return types