new_contents: # Licensed under a 3-clause BSD style license - see LICENSE.rst
  """
  Tests for the footprints module.
  """
  
  import numpy as np
  from numpy.testing import assert_equal
  import pytest
  
  from ..footprints import circular_footprint
  
  
  def test_footprints():
      footprint = circular_footprint(1)
      result = np.array([[0, 1, 0],
                         [1, 1, 1],
                         [0, 1, 0]])
      assert_equal(footprint, result)
  
      footprint = circular_footprint(2)
      result = np.array([[0, 0, 1, 0, 0],
                         [0, 1, 1, 1, 0],
                         [1, 1, 1, 1, 1],
                         [0, 1, 1, 1, 0],
                         [0, 0, 1, 0, 0]])
      assert_equal(footprint, result)
  
      with pytest.raises(ValueError):
          circular_footprint(5.1)
  
      with pytest.raises(ValueError):
          circular_footprint(0)
  
      with pytest.raises(ValueError):
          circular_footprint(-1)
  
      with pytest.raises(ValueError):
          circular_footprint(np.inf)
  
      with pytest.raises(ValueError):
          circular_footprint(np.nan)
  
subject: Add circular_footprint tests