code: def test_dir_v_ncol():
      p = (
          ggplot(mpg)
          + aes(x="displ", y="hwy")
          + facet_wrap("class", dir="v", ncol=4, as_table=False)
          + geom_point()
      )
      assert p == "dir_v_ncol"
  
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 18 for calling a global function with example usage: test_dir_v_ncol() without return types