code: def test_encode_names():
      # Test function for encoding numbers into property names
      b0 = b"\x00"
      assert encode_value_in_name(0, "foo", 10) == b"foo" + b0 * 7
      assert encode_value_in_name(1, "foo", 10) == b"foo" + b0 * 7
      assert (
          encode_value_in_name(8, "foo", 10)
          == b"foo" + b0 + b"8" + b0 * 5
      )
      assert (
          encode_value_in_name(40, "foobar", 10)
          == b"foobar" + b0 + b"40" + b0
      )
      assert encode_value_in_name(1, "foobarbazz", 10) == b"foobarbazz"
  
      with pytest.raises(ValueError):
          encode_value_in_name(1, "foobarbazzz", 10)
  
      with pytest.raises(ValueError):
          encode_value_in_name(2, "foobarbazzz", 10)
  
      assert encode_value_in_name(2, "foobarba", 10) == b"foobarba\x002"
  
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 2 for calling a global function with example usage: test_encode_names() without return types