code: def test_establish_variables_from_array(self):
      p = lm._LinearPlotter()
      p.establish_variables(
          None, x=self.df.x.values, y=self.df.y.values
      )
      npt.assert_array_equal(p.x, self.df.x)
      npt.assert_array_equal(p.y, self.df.y)
      assert p.data is None
  
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 3 for calling the TestLinearPlotter obj's underlying member method code with example usage: obj.test_establish_variables_from_array() without return types