      "        graph.add_edge(2, 1)\n",
      "        graph.add_edge(3, 2)\n",
      "        graph.add_edge(3, 4)\n",
      "\n",
      "        assert_equal(graph.shortest_path(nodes[0].key, nodes[2].key), [0, 1, 3, 2])\n",
      "        assert_equal(graph.shortest_path(nodes[0].key, nodes[0].key), [0])\n",
      "        assert_equal(graph.shortest_path(nodes[4].key, nodes[5].key), None)\n",
      "\n",
      "        print('Success: test_shortest_path')\n",
      "\n",
      "\n",
      "def main():\n",
 
</s>
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[2].key), [0, 1, 3, 2])\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[0].key), [0])\n",
    "        self.assertEqual(graph.shortest_path(nodes[4].key, nodes[5].key), None)\n",
      "        graph.add_edge(2, 1)\n",
      "        graph.add_edge(3, 2)\n",
      "        graph.add_edge(3, 4)\n",
      "\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[2].key), [0, 1, 3, 2])\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[0].key), [0])\n",
    "        self.assertEqual(graph.shortest_path(nodes[4].key, nodes[5].key), None)\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[2].key), [0, 1, 3, 2])\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[0].key), [0])\n",
    "        self.assertEqual(graph.shortest_path(nodes[4].key, nodes[5].key), None)\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[2].key), [0, 1, 3, 2])\n",
    "        self.assertEqual(graph.shortest_path(nodes[0].key, nodes[0].key), [0])\n",
    "        self.assertEqual(graph.shortest_path(nodes[4].key, nodes[5].key), None)\n",
      "\n",
      "        print('Success: test_shortest_path')\n",
      "\n",
      "\n",
      "def main():\n",
keep keep keep keep replace replace replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277)
graphs_trees/graph_shortest_path_unweighted/shortest_path_solution.ipynb