code: def test_slice_step():
      s = slice(0, 4, 2)
      x = gimg[s]
      assert x.shape == (2,) + tuple(gimg.shape[1:])
      x = gimg[0:4:2]
      assert x.shape == (2,) + tuple(gimg.shape[1:])
  
imports: import warnings
  from itertools import chain
  import nibabel
  import numpy
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_almost_equal, assert_array_equal
  from ...api import data_generator, parcels, write_data
  from ...reference.coordinate_map import AffineTransform, AxisError
  from ...reference.coordinate_system import CoordinateSystem
  from ..None import image
  from ..image import Image, is_image, iter_axis, rollimg
label_desc: Use image node_id 5 for calling a global function with example usage: test_slice_step() without return types