code: def test_facet_grid_drop_false():
      data = mpg.copy()
      data["drv"] = pd.Categorical(data["drv"], ["4", "f", "r", "Q"])
  
      p = (
          ggplot(data, aes(x="displ", y="hwy"))
          + geom_point()
          + facet_grid("drv ~ .", drop=False)
      )
      assert p == "facet_grid_drop_false"
  
imports: import numpy
  import pandas
  from plotnine import aes, annotate, facet_grid, facet_wrap, geom_abline, geom_path, geom_point, ggplot
  from plotnine.data import mpg, mtcars
label_desc: Use image node_id 15 for calling a global function with example usage: test_facet_grid_drop_false() without return types