code: def test_hausdorff_densify_nan():
      actual = shapely.hausdorff_distance(point, point, densify=np.nan)
      assert np.isnan(actual)
  
imports: import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal
  import shapely
  from shapely import GeometryCollection, LineString, MultiPoint, Point, Polygon
  from shapely.tests.common import empty, geometry_collection, ignore_invalid, line_string, linear_ring, multi_line_string, multi_point, multi_polygon, point, point_polygon_testdata, polygon, polygon_with_hole
label_desc: Use image node_id 15 for calling a global function with example usage: test_hausdorff_densify_nan() without return types