code: def test_string_sort():
      filenames = [
          "f9.10.png",
          "f9.9.png",
          "f10.10.png",
          "f10.9.png",
          "e9.png",
          "e10.png",
          "em.png",
      ]
      expected_filenames = [
          "e9.png",
          "e10.png",
          "em.png",
          "f9.9.png",
          "f9.10.png",
          "f10.9.png",
          "f10.10.png",
      ]
      sorted_filenames = sorted(filenames, key=alphanumeric_key)
      assert_equal(expected_filenames, sorted_filenames)
  
imports: import os
  import itertools
  import numpy
  import imageio.v3
  from skimage import data_dir
  from skimage.io.collection import ImageCollection, MultiImage, alphanumeric_key
  from skimage.io import reset_plugins
  from skimage._shared import testing
  from skimage._shared.testing import assert_equal, assert_allclose, fetch
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_string_sort() without return types