code: def mask_3x4():
      """
      Generates a mask  3x4
  
      Returns
      -------
      out : ndarray
          3x4 uint8 image
      """
  
      mask = (
          np.array([[0, 1, 1, 1], [0, 1, 1, 0], [0, 1, 1, 0]])
          .reshape((3, 4))
          .astype(np.uint8)
      )
      return mask
  
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 5 for calling a global function with example usage: mask_3x4() and returns: mask