code: def test_visuals_scalar(self, xyz_levels: XYZ_Levels) -> None:
      # Test every visual property as a scalar
      x, y, z, levels = xyz_levels
      kwargs = dict(
          fill_color="orange",
          fill_alpha=0.3,
          hatch_color="yellow",
          hatch_alpha=0.8,
          hatch_weight=2,
          hatch_scale=34,
          hatch_pattern="@",
          line_color="red",
          line_width=1.5,
          line_alpha=0.7,
          line_join="round",
          line_cap="square",
          line_dash="dotdash",
          line_dash_offset=3,
      )
      cr = from_contour(x, y, z, levels, **kwargs)
      fill = cr.fill_renderer.glyph
      assert fill.fill_color == "orange"
      assert fill.fill_alpha == 0.3
      assert fill.hatch_color == "yellow"
      assert fill.hatch_alpha == 0.8
      assert fill.hatch_weight == 2
      assert fill.hatch_scale == 34
      assert fill.hatch_pattern == "@"
      line = cr.line_renderer.glyph
      assert line.line_color == "red"
      assert line.line_width == 1.5
      assert line.line_alpha == 0.7
      assert line.line_join == "round"
      assert line.line_cap == "square"
      assert line.line_dash == "dotdash"
      assert line.line_dash_offset == 3
  
imports: from __future__ import annotations
  import pytest
  from typing import TYPE_CHECKING
  import numpy
  from bokeh.plotting.contour import FillData, LineData, contour_data, from_contour
label_desc: Use image node_id 9 for calling the Test_from_contour obj's underlying member method code with example usage: obj.test_visuals_scalar(xyz_levels) without return types