code: def test_rect_nofill():
      p = (
          ggplot(data)
          + aes(xmin="xmin", xmax="xmax", ymin="ymin", ymax="ymax")
          + geom_rect(color="red", fill=None, size=2)
          + geom_rect(
              aes(ymin="ymin+2", ymax="ymax+2"),
              color="blue",
              fill="None",
              size=2,
          )
          + geom_rect(
              aes(ymin="ymin+4", ymax="ymax+4"),
              color="green",
              fill="",
              size=2,
          )
          + geom_rect(
              aes(ymin="ymin+6", ymax="ymax+6"),
              color="yellow",
              fill="gray",
              size=2,
          )
      )
  
      assert p == "rect-nofill"
  
file_path: plotnine/tests/test_geom_rect_tile.py
imports: import numpy
  import pandas
  from plotnine import aes, coord_trans, geom_point, geom_rect, geom_tile, ggplot, labs
label_desc: Use image node_id 2 for calling a global function with example usage: test_rect_nofill() without return types