code: def test_facet_wrap_two_vars():
      p = g + facet_wrap("~var1+var2")
      p2 = g + facet_wrap("~class+var2")  # python keyword in formula
      assert p == "facet_wrap_two_vars"
      assert p2 == "facet_wrap_two_vars"
  
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 3 for calling a global function with example usage: test_facet_wrap_two_vars() without return types