docstr: Test square footprints
docstr_tok: ["Test","square","footprints"]
code: def test_square_footprint(self):
      """Test square footprints"""
      for k in range(0, 5):
          actual_mask = footprints.square(k)
          expected_mask = np.ones((k, k), dtype="uint8")
          assert_equal(expected_mask, actual_mask)
  
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 1 for calling the TestFootprints obj's underlying member method code with example usage: obj.test_square_footprint() without return types