code: def test_open_img_returns_numpy_array_when_image_is_tiff(
      samples_source, fn
  ):
      image = open_img(samples_source / fn)
  
      assert isinstance(image, np.ndarray)
  
imports: import pytest
  from icevision.all import *
  from icevision.utils.imageio import open_gray_scale_image
label_desc: Use image node_id 10 for calling a global function with example usage: test_open_img_returns_numpy_array_when_image_is_tiff(samples_source, fn) without return types