code: def setup_class(self):
      self.black_pixel = 255 * np.ones((6, 6), dtype=np.uint8)
      self.black_pixel[2, 2] = 0
      self.white_pixel = 255 - self.black_pixel
      self.footprints = [
          footprints.square(2),
          footprints.rectangle(2, 2),
          footprints.rectangle(2, 1),
          footprints.rectangle(1, 2),
      ]
  
imports: import inspect
  import numpy
  import pytest
  from scipy import ndimage
  from numpy.testing import assert_allclose, assert_array_equal, assert_equal
  from skimage import color, data, transform
  from skimage._shared._warnings import expected_warnings
  from skimage._shared.testing import fetch
  from skimage.morphology import gray, footprints
  from skimage.util import img_as_uint, img_as_ubyte
label_desc: Use image node_id 1 for calling the TestEccentricStructuringElements obj's underlying member method code with example usage: obj.setup_class() without return types