code: def test_set_line_coll_dash():
      fig, ax = plt.subplots()
      np.random.seed(0)
      # Testing setting linestyles for line collections.
      # This should not produce an error.
      ax.contour(np.random.randn(20, 30), linestyles=[(0, (3, 3))])
  
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 3 for calling a global function with example usage: test_set_line_coll_dash() without return types