code: def test_set_properties(self):
      x = [0, 0, 1, 2]
      y = [1, 2, 3, 4]
  
      m = Dash(color=".8", linewidth=4)
      p = Plot(x=x, y=y).add(m).plot()
      (lines,) = p._figure.axes[0].collections
  
      for color in lines.get_color():
          assert same_color(color, m.color)
      for linewidth in lines.get_linewidth():
          assert linewidth == m.linewidth
  
imports: import numpy
  import matplotlib
  from matplotlib.colors import same_color, to_rgba
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from seaborn._core.plot import Plot
  from seaborn._core.moves import Dodge
  from seaborn._marks.line import Dash, Line, Path, Lines, Paths, Range
label_desc: Use image node_id 3 for calling the TestDash obj's underlying member method code with example usage: obj.test_set_properties() without return types