docstr: Test disk footprints
docstr_tok: ["Test","disk","footprints"]
code: def test_footprint_disk(self):
      """Test disk footprints"""
      self.strel_worker("data/disk-matlab-output.npz", footprints.disk)
  
imports: import numpy
  import pytest
  from numpy.testing import assert_equal
  from skimage._shared.testing import fetch
  from skimage.morphology import footprints
label_desc: Use image node_id 6 for calling the TestFootprints obj's underlying member method code with example usage: obj.test_footprint_disk() without return types