code: def test_custom_load_func_sequence(self):
      filename = fetch("data/no_time_for_that_tiny.gif")
  
      def reader(index):
          return iio3.imread(filename, index=index)
  
      ic = ImageCollection(range(24), load_func=reader)
      # the length of ic should be that of the given load_pattern sequence
      assert len(ic) == 24
      # GIF file has frames of size 25x14 with 4 channels (RGBA)
      assert ic[0].shape == (25, 14, 3)
  
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 6 for calling the TestImageCollection obj's underlying member method code with example usage: obj.test_custom_load_func_sequence() and returns: iio3