code: def test_durbin(self):
      r_result = np.array([0.205758, 8.468354, 6])
      result = som.test_durbin(self.df_bn)
      self.assertTrue(np.allclose(result, r_result))
  
imports: import os
  import sys
  import unittest
  import matplotlib
  import scikit_posthocs._posthocs
  import scikit_posthocs._omnibus
  import scikit_posthocs._outliers
  import scikit_posthocs._plotting
  import scikit_posthocs._global
  import seaborn
  import numpy
  import matplotlib.axes
  from pandas import DataFrame, Series
label_desc: Use image node_id 19 for calling the TestPosthocs obj's underlying member method code with example usage: obj.test_durbin() without return types