code: def test_affine(self):
      # Make sure we find orientation/position/spacing info
      dw = didw.wrapper_from_file(DATA_FILE_4D)
      aff = dw.affine
  
imports: import gzip
  from copy import copy
  from decimal import Decimal
  from hashlib import sha1
  from os.path import dirname
  from os.path import join
  from unittest import TestCase
  import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  from ...tests.nibabel_data import get_nibabel_data, needs_nibabel_data
  from ...volumeutils import endian_codes
  from ..None import dicomreaders
  from ..None import dicomwrappers
  from .None import dicom_test, have_dicom, pydicom
label_desc: Use image node_id 5 for calling the TestMultiFrameWrapper obj's underlying member method code with example usage: obj.test_affine() without return types