code: def test_uneven_num_of_lines():
      @as_labeller
      def func(s):
          if s == "3":
              s = f"{s}\nline2\nline3\nline4"
          return s
  
      p = g + facet_wrap("~ gear + am", labeller=func)
      # NOTE: The allocated space for the strip is still not yet
      # enough for the text
      assert p == "uneven_num_of_lines"
  
file_path: plotnine/tests/test_facet_labelling.py
imports: from plotnine import aes, as_labeller, facet_grid, facet_wrap, geom_point, ggplot, labeller
  from plotnine.data import mtcars
label_desc: Use image node_id 11 for calling a global function with example usage: test_uneven_num_of_lines() and returns: s