code: def test_ggsave(self):
      ggsave(p, verbose=False)
      fn = p._save_filename("pdf")
      assert_exist_and_clean(fn, "default filename")
  
imports: import warnings
  from pathlib import Path
  import matplotlib.pyplot
  import pandas
  import pytest
  from plotnine import aes, facet_wrap, geom_point, geom_text, ggplot, ggsave, theme_xkcd
  from plotnine.data import mtcars
  from plotnine.exceptions import PlotnineError, PlotnineWarning
label_desc: Use image node_id 6 for calling the TestArguments obj's underlying member method code with example usage: obj.test_ggsave() without return types