code: def expected_mask(mask_args):
      """Create an expected mask."""
      mask = np.zeros((9, 9, 5))
      if mask_args == {}:
          return mask
  
      mask[2:7, 2:7, 2] = 1
      return mask
  
imports: import os
  import shutil
  import warnings
  from tempfile import mkdtemp
  import nibabel
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from nilearn._utils import data_gen, exceptions, testing
  from nilearn._utils.class_inspect import get_params
  from nilearn.image import get_data, index_img
  from nilearn.maskers import NiftiMasker
  from nilearn.maskers.nifti_masker import _filter_and_mask
label_desc: Use image node_id 19 for calling a global function with example usage: expected_mask(mask_args) and returns: mask, mask