code: def test_node_attribute_xy_selfloop(self):
      attrxy = sorted(nx.node_attribute_xy(self.S, "fish"))
      attrxy_result = [("one", "one"), ("two", "two")]
      assert attrxy == attrxy_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 TestAttributeMixingXY obj's underlying member method code with example usage: obj.test_node_attribute_xy_selfloop() without return types