code: def test_patheffects():
      mpl.rcParams["path.effects"] = [
          patheffects.withStroke(linewidth=4, foreground="w")
      ]
      fig, ax = plt.subplots()
      ax.plot([1, 2, 3])
      with io.BytesIO() as ps:
          fig.savefig(ps, format="ps")
  
imports: from collections import Counter
  from pathlib import Path
  import io
  import re
  import tempfile
  import numpy
  import pytest
  from matplotlib import cbook, path, patheffects, font_manager
  from matplotlib.figure import Figure
  from matplotlib.patches import Ellipse
  from matplotlib.testing._markers import needs_ghostscript, needs_usetex
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import matplotlib
  import matplotlib.collections
  import matplotlib.colors
  import matplotlib.pyplot
label_desc: Use image node_id 2 for calling a global function with example usage: test_patheffects() without return types