code: def test_gggrid_flavor():
      spec = gg.gggrid([gg.ggplot()]) + gg.flavor_darcula()
      assert "theme" in spec.as_dict()
      assert spec.as_dict()["theme"] == {"flavor": "darcula"}
  
file_path: lets-plot/python-package/test/plot/test_gggrid_theme.py
imports: import lets_plot
  from lets_plot._global_settings import PLOT_THEME
label_desc: Use image node_id 2 for calling a global function with example usage: test_gggrid_flavor() without return types