code: def mask_5x5():
      """
      Generates a mask 5x5. It is all ones, besides the edges
  
      Returns
      -------
      out : ndarray
          5x5 uint8 image
      """
      img = np.ones((5, 5, 1))
  
      img[:, :2] = 2
      img[:, -2:] = 2
      img[:2, :] = 2
      img[-2, :] = 2
      return img.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 10 for calling a global function with example usage: mask_5x5() and returns: img