code: def test_global_theme():
      gg.LetsPlot.set_theme(theme(axis_tooltip=element_blank()))
  
      spec = gg.ggplot() + _geom("foo")
  
      assert spec.as_dict()["theme"]["axis_tooltip"]["blank"]
      assert isinstance(spec.props()["theme"]["axis_tooltip"], dict)
  
imports: import lets_plot
  from lets_plot import element_blank
  from lets_plot import element_rect
  from lets_plot.plot import theme
  from lets_plot.plot.geom import _geom
  from lets_plot.plot.theme_set import theme_classic, flavor_darcula, flavor_solarized_dark
label_desc: Use image node_id 10 for calling a global function with example usage: test_global_theme() without return types