code: def test_load_image_returns_none_wrong_input():
      inp = "test_string"
      assert load_image(inp) is None
  
imports: import pytest
  from pathlib import Path
  import numpy
  from PIL import Image
  from imagededup.utils.image_utils import preprocess_image, load_image, _check_3_dim, _add_third_dim, _raise_wrong_dim_value_error, check_image_array_hash, expand_image_array_cnn
label_desc: Use image node_id 19 for calling a global function with example usage: test_load_image_returns_none_wrong_input() without return types