def test_original_tree_with_two_nodes_switched_tree_rf_metric(self):
     """Rf metric of original tree and a duplicate tree with two nodes switched"""
     result = compare_two_trees.robinson_foulds_metric(self.orig_tree,
                                                                 self.two_nodes_switched_tree) 
     self.assertEqual(6, result)
 def test_original_tree_with_duplicate_tree_rf_metric(self):                          
     """Rf metric of original tree and duplicate tree"""
     result = compare_two_trees.robinson_foulds_metric(self.orig_tree, self.same_tree) 
     self.assertEqual(0, result)