      "# %load test_height.py\n",
      "from nose.tools import assert_equal\n",
      "\n",
      "\n",
      "class TestHeight(object):\n",
      "\n",
      "    def test_height(self):\n",
      "        bst = BstHeight(Node(5))\n",
      "        assert_equal(bst.height(bst.root), 1)\n",
      "        bst.insert(2)\n",
 
</s> remove     "class TestHeight(object):\n",
 </s> add     "class TestHeight(unittest.TestCase):\n", </s> remove     "        assert_equal(bst.height(bst.root), 1)\n",
 </s> add     "        self.assertEqual(bst.height(bst.root), 1)\n", </s> remove     "        assert_equal(bst.height(bst.root), 1)\n",
 </s> add     "        self.assertEqual(bst.height(bst.root), 1)\n", </s> remove     "from nose.tools import assert_equal\n",
 </s> add     "import unittest\n", </s> remove     "from nose.tools import assert_equal\n",
 </s> add     "import unittest\n",
    "class TestHeight(unittest.TestCase):\n",
      "# %load test_height.py\n",
      "from nose.tools import assert_equal\n",
      "\n",
      "\n",
    "class TestHeight(unittest.TestCase):\n",
      "\n",
      "    def test_height(self):\n",
      "        bst = BstHeight(Node(5))\n",
      "        assert_equal(bst.height(bst.root), 1)\n",
      "        bst.insert(2)\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/tree_height/height_challenge.ipynb