code: def test_residplot_lowess(self):
      ax = lm.residplot(x="x", y="y", data=self.df, lowess=True)
      assert len(ax.lines) == 2
  
      x, y = ax.lines[1].get_xydata().T
      npt.assert_array_equal(x, np.sort(self.df.x))
  
imports: import warnings
  import numpy
  import matplotlib
  import matplotlib.pyplot
  import pandas
  import pytest
  import numpy.testing
  import pandas.testing
  from seaborn import regression
  from seaborn.palettes import color_palette
label_desc: Use image node_id 17 for calling the TestRegressionPlots obj's underlying member method code with example usage: obj.test_residplot_lowess() without return types