      "        graph.add_edge(2, 1, 6)\n",
      "        graph.add_edge(3, 2, 7)\n",
      "        graph.add_edge(3, 4, 8)\n",
      "        graph.dfs(nodes[0], self.results.add_result)\n",
      "        assert_equal(str(self.results), \"[0, 1, 3, 2, 4, 5]\")\n",
      "\n",
      "        print('Success: test_dfs')\n",
      "\n",
      "\n",
      "def main():\n",
 
</s> remove     "        assert_equal(str(self.results), \"[0, 1, 3, 2, 4, 5]\")\n",
 </s> add     "        self.assertEqual(str(self.results), \"[0, 1, 3, 2, 4, 5]\")\n", </s> remove     "        assert_equal(str(self.results), \"[0, 1, 4, 5, 3, 2]\")\n",
 </s> add     "        self.assertEqual(str(self.results), \"[0, 1, 4, 5, 3, 2]\")\n", </s> remove     "        assert_equal(str(self.results), \"[0, 1, 4, 5, 3, 2]\")\n",
 </s> add     "        self.assertEqual(str(self.results), \"[0, 1, 4, 5, 3, 2]\")\n", </s> remove         assert_equal(str(self.results), "[0, 1, 3, 2, 4, 5]")
 </s> add         self.assertEqual(str(self.results), "[0, 1, 3, 2, 4, 5]") </s> remove     "        assert_equal(graph.path_exists(nodes[0], nodes[2]), True)\n",
    "        assert_equal(graph.path_exists(nodes[0], nodes[0]), True)\n",
    "        assert_equal(graph.path_exists(nodes[4], nodes[5]), False)\n",
 </s> add     "        self.assertEqual(graph.path_exists(nodes[0], nodes[2]), True)\n",
    "        self.assertEqual(graph.path_exists(nodes[0], nodes[0]), True)\n",
    "        self.assertEqual(graph.path_exists(nodes[4], nodes[5]), False)\n",
    "        self.assertEqual(str(self.results), \"[0, 1, 3, 2, 4, 5]\")\n",
      "        graph.add_edge(2, 1, 6)\n",
      "        graph.add_edge(3, 2, 7)\n",
      "        graph.add_edge(3, 4, 8)\n",
      "        graph.dfs(nodes[0], self.results.add_result)\n",
    "        self.assertEqual(str(self.results), \"[0, 1, 3, 2, 4, 5]\")\n",
      "\n",
      "        print('Success: test_dfs')\n",
      "\n",
      "\n",
      "def main():\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/graph_dfs/dfs_challenge.ipynb