code: def test_facet_wrap_label_both():
      p = g + facet_wrap("~var1+var2", labeller="label_both")
      assert p == "facet_wrap_label_both"
  
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 4 for calling a global function with example usage: test_facet_wrap_label_both() without return types