code: def test_Polygon_close():
      #: GitHub issue #1018 identified a bug in the Polygon handling
      #: of the closed attribute; the path was not getting closed
      #: when set_xy was used to set the vertices.
  
      # open set of vertices:
      xy = [[0, 0], [0, 1], [1, 1]]
      # closed set:
      xyclosed = xy + [[0, 0]]
  
      # start with open path and close it:
      p = Polygon(xy, closed=True)
      assert p.get_closed()
      assert_array_equal(p.get_xy(), xyclosed)
      p.set_xy(xy)
      assert_array_equal(p.get_xy(), xyclosed)
  
      # start with closed path and open it:
      p = Polygon(xyclosed, closed=False)
      assert_array_equal(p.get_xy(), xy)
      p.set_xy(xyclosed)
      assert_array_equal(p.get_xy(), xy)
  
      # start with open path and leave it open:
      p = Polygon(xy, closed=False)
      assert not p.get_closed()
      assert_array_equal(p.get_xy(), xy)
      p.set_xy(xy)
      assert_array_equal(p.get_xy(), xy)
  
      # start with closed path and leave it closed:
      p = Polygon(xyclosed, closed=True)
      assert_array_equal(p.get_xy(), xyclosed)
      p.set_xy(xyclosed)
      assert_array_equal(p.get_xy(), xyclosed)
  
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_array_equal
  import pytest
  import matplotlib
  from matplotlib.patches import Annulus, Ellipse, Patch, Polygon, Rectangle, FancyArrowPatch, FancyArrow, BoxStyle, Arc
  from matplotlib.testing.decorators import image_comparison, check_figures_equal
  from matplotlib.transforms import Bbox
  import matplotlib.pyplot
  from matplotlib import collections, colors, patches, path, transforms, rcParams
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: test_Polygon_close() without return types