code: def test_node_degree_xy_selfloop(self):
      xy = sorted(nx.node_degree_xy(self.S))
      xy_result = sorted([(2, 2), (2, 2)])
      assert xy == xy_result
  
file_path: networkx/networkx/algorithms/assortativity/tests/test_pairs.py
imports: import networkx
  from .base_test import BaseTestAttributeMixing, BaseTestDegreeMixing
label_desc: Use image node_id 5 for calling the TestDegreeMixingXY obj's underlying member method code with example usage: obj.test_node_degree_xy_selfloop() without return types