code: def test_path_continuously_varying_line_width_op(self):
      xs = [1, 2, 3, 4]
      ys = xs[::-1]
      line_width = [1, 7, 3, 2]
      data = {"x": xs, "y": ys, "line_width": line_width}
      path = Path([data], vdims="line_width").opts(
          linewidth="line_width"
      )
      plot = mpl_renderer.get_plot(path)
      artist = plot.handles["artist"]
      self.assertEqual(artist.get_linewidths(), line_width)
  
imports: import numpy
  import pytest
  from holoviews.core import NdOverlay
  from holoviews.core.options import AbbreviatedException
  from holoviews.core.spaces import HoloMap
  from holoviews.element import Contours, Path, Polygons
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 3 for calling the TestPathPlot obj's underlying member method code with example usage: obj.test_path_continuously_varying_line_width_op() without return types