code: def mini_img(make_mini_img) -> SurfaceImage:
      return make_mini_img()
  
file_path: nilearn/nilearn/experimental/surface/tests/conftest.py
imports: from typing import Callable
  import numpy
  import pytest
  from nilearn.experimental.surface import InMemoryMesh, PolyMesh, SurfaceImage, load_fsaverage
label_desc: Use image node_id 4 for calling a global function with example usage: mini_img(make_mini_img) and returns: make_mini_img