code: def test_vline_layout(self):
      layout = (
          (VLine(1) + VLine(2) + VLine(3) + VLine(4))
          .cols(2)
          .opts(vspacing=0, hspacing=0)
      )
      state = self._get_plot_state(layout)
  
      shapes = state["layout"]["shapes"]
      self.assertEqual(len(shapes), 4)
  
      # Check shapes
      self.assert_vline(shapes[0], 3, xref="x", ydomain=[0.0, 0.5])
      self.assert_vline(shapes[1], 4, xref="x2", ydomain=[0.0, 0.5])
      self.assert_vline(shapes[2], 1, xref="x3", ydomain=[0.5, 1.0])
      self.assert_vline(shapes[3], 2, xref="x4", ydomain=[0.5, 1.0])
  
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 5 for calling the TestVLineHLine obj's underlying member method code with example usage: obj.test_vline_layout() without return types