code: def test_simple(self):
      self.generate("test_simple", "test_lowess_simple.csv")
  
imports: import os
  import numpy
  from numpy.testing import assert_, assert_allclose, assert_almost_equal, assert_equal, assert_raises
  import pytest
  from statsmodels.nonparametric.smoothers_lowess import lowess
  import pandas
label_desc: Use image node_id 5 for calling the TestLowess obj's underlying member method code with example usage: obj.test_simple() without return types