code: def test_ribbon_facetting():
      p = (
          ggplot(
              data, aes("x", ymin="ymin", ymax="ymax", fill="factor(z)")
          )
          + geom_ribbon()
          + facet_wrap("~ z")
      )
  
      assert p == "ribbon_facetting"
  
file_path: plotnine/tests/test_geom_ribbon_area.py
imports: import numpy
  import pandas
  from plotnine import aes, after_stat, coord_flip, facet_wrap, geom_area, geom_line, geom_ribbon, ggplot, scale_x_continuous
label_desc: Use image node_id 3 for calling a global function with example usage: test_ribbon_facetting() without return types