code: def test_linestyle_variants():
      fig, ax = plt.subplots()
      for ls in [
          "-",
          "solid",
          "--",
          "dashed",
          "-.",
          "dashdot",
          ":",
          "dotted",
          (0, None),
          (0, ()),
          (0, []),  # gh-22930
      ]:
          ax.plot(range(10), linestyle=ls)
      fig.canvas.draw()
  
imports: import itertools
  import platform
  import timeit
  from types import SimpleNamespace
  from cycler import cycler
  import numpy
  from numpy.testing import assert_array_equal
  import pytest
  import matplotlib
  import matplotlib
  from matplotlib import _path
  import matplotlib.lines
  from matplotlib.markers import MarkerStyle
  from matplotlib.path import Path
  import matplotlib.pyplot
  import matplotlib.transforms
  from matplotlib.testing.decorators import image_comparison, check_figures_equal
label_desc: Use image node_id 8 for calling a global function with example usage: test_linestyle_variants() without return types