          graph.add_edge(1, 4, 4)
          graph.add_edge(2, 1, 6)
          graph.add_edge(3, 2, 7)
          graph.add_edge(3, 4, 8)
          bfs(nodes[0], self.results.add_result)
          assert_equal(str(self.results), "[0, 1, 4, 5, 3, 2]")
  
          print('Success: test_bfs')
  
  
 
</s> remove     "        bfs(nodes[0], self.results.add_result)\n",
 </s> add     "        graph.bfs(nodes[0], self.results.add_result)\n", </s> remove     "        bfs(nodes[0], self.results.add_result)\n",
 </s> add     "        graph.bfs(nodes[0], self.results.add_result)\n", </s> remove         graph = Graph()
 </s> add         graph = GraphBfs() </s> remove     "        graph = Graph()\n",
 </s> add     "        graph = GraphBfs()\n", </s> remove     "        graph = Graph()\n",
 </s> add     "        graph = GraphBfs()\n",
        graph.bfs(nodes[0], self.results.add_result)
          graph.add_edge(1, 4, 4)
          graph.add_edge(2, 1, 6)
          graph.add_edge(3, 2, 7)
          graph.add_edge(3, 4, 8)
        graph.bfs(nodes[0], self.results.add_result)
          assert_equal(str(self.results), "[0, 1, 4, 5, 3, 2]")
  
          print('Success: test_bfs')
  
  
keep keep keep keep replace keep keep keep keep keep
 Move graph bfs to a class 
graphs_trees/graph_bfs/test_bfs.py