code: def test_io_trk_load():
      npt.assert_(
          trk_loader(FILEPATH_DIX["gs.trk"]),
          msg="trk_loader should be able to load a trk",
      )
      npt.assert_(
          not trk_loader("fake_file.TRK"),
          msg="trk_loader should not be able to load a TRK",
      )
      npt.assert_(
          not trk_loader(FILEPATH_DIX["gs.tck"]),
          msg="trk_loader should not be able to load a tck",
      )
      npt.assert_(
          not trk_loader(FILEPATH_DIX["gs.fib"]),
          msg="trk_loader should not be able to load a fib",
      )
      npt.assert_(
          not trk_loader(FILEPATH_DIX["gs.dpy"]),
          msg="trk_loader should not be able to load a dpy",
      )
  
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 13 for calling a global function with example usage: test_io_trk_load() without return types