code: def test_fill3():
      canvas = np.zeros((4, 4), bool)
      # This polygon also has a horizontal and a vertical edge
      polygon = [(1, 1), (1, 2), (2, 1)]
      mahotas.polygon.fill_polygon(polygon, canvas)
      assert canvas.sum()
  
file_path: mahotas/mahotas/tests/test_polygon.py
imports: import numpy
  import mahotas
  import mahotas.polygon
  from mahotas.polygon import fill_polygon, fill_convexhull
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_fill3() without return types