code: def test_gls(self):
      p = self.p + geom_smooth(aes(y="y_noisy"), method="gls")
      p.draw_test()
  
imports: import numpy
  import pandas
  import pytest
  import statsmodels.api
  from plotnine import aes, coord_trans, geom_point, geom_smooth, ggplot, stat_smooth
  from plotnine.exceptions import PlotnineWarning
label_desc: Use image node_id 4 for calling the TestOther obj's underlying member method code with example usage: obj.test_gls() without return types