code: def _shape_3d_default():
      """Return default shape for a 3D image.
  
      Mostly used for set up in other fixtures in other testing modules.
      """
      return (10, 10, 10)
  
imports: import warnings
  import nibabel
  import numpy
  import pytest
  from nibabel import Nifti1Image
  from nilearn import image
  from nilearn.datasets.tests._testing import request_mocker
  from nilearn.datasets.tests._testing import temp_nilearn_data_dir
  from nilearn.experimental.surface.tests.conftest import make_mini_img, mini_img, mini_mesh
label_desc: Use image node_id 11 for calling a global function with example usage: _shape_3d_default() and returns: int,  int,  int