code: def test_k4(self):
      expected = {
          frozenset([0, 1, 2, 3, 7, 13]),
          frozenset([8, 32, 30, 33]),
          frozenset([32, 33, 29, 23]),
      }
      self._check_communities(4, expected)
  
file_path: networkx/networkx/algorithms/community/tests/test_kclique.py
imports: from itertools import combinations
  import pytest
  import networkx
label_desc: Use image node_id 5 for calling the TestZacharyKarateClub obj's underlying member method code with example usage: obj.test_k4() without return types