code: def test_bfs(self, setup, kg, root, max_depth, is_reverse):
      root = f"{URL}#{root}"
      walker = CommunityWalker(max_depth, None, random_state=42)
      walker._community_detection(kg)
      walks = walker._bfs(kg, Vertex(root), is_reverse)
      for walk in walks:
          assert len(walk) <= (max_depth * 2) + 1
          if is_reverse:
              assert walk[-1].name == root
          else:
              assert walk[0].name == root
  
file_path: pyRDF2Vec/tests/walkers/test_community.py
imports: import itertools
  import pytest
  from pyrdf2vec.graphs import KG, Vertex
  from pyrdf2vec.walkers import CommunityWalker
label_desc: Use image node_id 2 for calling the TestCommunityWalker obj's underlying member method code with example usage: obj.test_bfs(setup, kg, root, max_depth, is_reverse) without return types