code: def test_load_empty_file(self):
      for lazy_load in [False, True]:
          trk = TrkFile.load(
              DATA["empty_trk_fname"], lazy_load=lazy_load
          )
          with pytest.warns(Warning) if lazy_load else error_warnings():
              assert_tractogram_equal(
                  trk.tractogram, DATA["empty_tractogram"]
              )
  
imports: import copy
  import os
  import sys
  import unittest
  from io import BytesIO
  from os.path import join
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from ...testing import assert_arr_dict_equal, clear_and_catch_warnings, data_path, error_warnings
  from ..None import trk
  from ..header import Field
  from ..tractogram import Tractogram
  from ..tractogram_file import HeaderError, HeaderWarning
  from ..trk import TrkFile, decode_value_from_name, encode_value_in_name, get_affine_trackvis_to_rasmm
  from .test_tractogram import assert_tractogram_equal
label_desc: Use image node_id 1 for calling the TestTRK obj's underlying member method code with example usage: obj.test_load_empty_file() without return types