code: def test_low_io_vtk():
      with TemporaryDirectory() as tmp_dir:
          fname = os.path.join(tmp_dir, "test.fib")
  
          # Test save
          save_vtk_streamlines(STREAMLINES, fname, binary=True)
          tracks = load_vtk_streamlines(fname)
          npt.assert_equal(len(tracks), len(STREAMLINES))
          npt.assert_array_almost_equal(
              tracks[1], STREAMLINE, decimal=4
          )
  
imports: import os
  from tempfile import TemporaryDirectory
  from urllib.error import URLError, HTTPError
  from dipy.data import get_fnames
  from dipy.io.streamline import load_tractogram, save_tractogram, load_trk, save_trk
  from dipy.io.stateful_tractogram import Space, StatefulTractogram
  from dipy.io.utils import create_nifti_header
  from dipy.io.vtk import save_vtk_streamlines, load_vtk_streamlines
  from dipy.tracking.streamline import Streamlines
  import numpy
  import numpy.testing
  import pytest
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 10 for calling a global function with example usage: test_low_io_vtk() without return types