docstr: Finds pole of inaccessibility for a concave polygon and ensures that
  the point is inside.
docstr_tok: ["Finds","pole","of","inaccessibility","for","a","concave","polygon","and","ensures","that","the","point","is","inside","."]
code: def test_concave_polygon(self):
      """
      Finds pole of inaccessibility for a concave polygon and ensures that
      the point is inside.
  
      """
      concave_polygon = LineString(
          [(500, 0), (0, 0), (0, 500), (500, 500)]
      ).buffer(100)
      label = polylabel(concave_polygon)
      assert concave_polygon.contains(label)
  
file_path: shapely/shapely/tests/legacy/test_polylabel.py
imports: import unittest
  import pytest
  from shapely.algorithms.polylabel import Cell, polylabel
  from shapely.errors import TopologicalError
  from shapely.geometry import LineString, Point, Polygon
label_desc: Use image node_id 4 for calling the PolylabelTestCase obj's underlying member method code with example usage: obj.test_concave_polygon() without return types