code: def test_ribbon_outline_type(self):
      assert self.p == "ribbon_outline_type"
  
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 1 for calling the TestOutlineType obj's underlying member method code with example usage: obj.test_ribbon_outline_type() without return types