code: def img_3x3_rgb():
      """
      Generates a grayscale image 3x4
  
      Returns
      -------
      out : ndarray
          3x4x1 uint8 image
      """
      img = (
          np.array([[0, 1, 1], [1, 0, 1], [1, 1, 1]])
          .reshape((3, 3, 1))
          .astype(np.uint8)
      )
      return np.dstack((img, img, img)) * 255
  
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 7 for calling a global function with example usage: img_3x3_rgb() and returns: unknown