code: def test_open_gray_scale_image_returns_stacked_channels_with_same_values(
      samples_source, fn
  ):
      image = open_gray_scale_image(samples_source / fn)
  
      assert (image[:, :, 0] == image[:, :, 1]).all()
      assert (image[:, :, 0] == image[:, :, 2]).all()
      assert (image[:, :, 1] == image[:, :, 2]).all()
  
imports: import pytest
  from icevision.all import *
  from icevision.utils.imageio import open_gray_scale_image
label_desc: Use image node_id 14 for calling a global function with example usage: test_open_gray_scale_image_returns_stacked_channels_with_same_values(samples_source, fn) without return types