code: def test_vline_styling(self):
      self.assert_shape_element_styling(VLine(3))
  
imports: import numpy
  from holoviews.element import Bounds, Box, HLine, Path, Rectangles, Segments, Tiles, VLine
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 7 for calling the TestVLineHLine obj's underlying member method code with example usage: obj.test_vline_styling() without return types