code: def test_valid_linestyles():
      line = mlines.Line2D([], [])
      with pytest.raises(ValueError):
          line.set_linestyle("aardvark")
  
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 9 for calling a global function with example usage: test_valid_linestyles() without return types