code: def img_2x2():
      """
      Generates a 2x2 grayscale image (uint8)
  
      Returns
      -------
      out : ndarray
          2x2x1 uint8 image
      """
      return (
          np.array([[1, 0], [1, 1]]).reshape((2, 2, 1)).astype(np.uint8)
      )
  
file_path: solt/tests/fixtures.py
imports: import pytest
  import numpy
  from .utils import gen_gs_img_black_edge
label_desc: Use image node_id 1 for calling a global function with example usage: img_2x2() and returns: np