      "\n",
      "\n",
      "class TestBstValidate(object):\n",
      "\n",
      "    @raises(Exception)\n",
      "    def test_bst_validate_empty(self):\n",
      "        validate_bst(None)\n",
      "\n",
      "    def test_bst_validate(self):\n",
      "        bst = BstValidate(Node(5))\n",
 
</s> remove     "    @raises(Exception)\n",
 </s> add  </s> remove     "        validate_bst(None)\n",
 </s> add     "        bst = BstValidate(None)\n",
    "        bst.validate()\n", </s> remove     "        validate_bst(None)\n",
 </s> add     "        bst = BstValidate(None)\n",
    "        bst.validate()\n", </s> remove     "class TestBstValidate(object):\n",
 </s> add     "class TestBstValidate(unittest.TestCase):\n", </s> remove     "class TestBstValidate(object):\n",
 </s> add     "class TestBstValidate(unittest.TestCase):\n",
      "\n",
      "\n",
      "class TestBstValidate(object):\n",
      "\n",

      "    def test_bst_validate_empty(self):\n",
      "        validate_bst(None)\n",
      "\n",
      "    def test_bst_validate(self):\n",
      "        bst = BstValidate(Node(5))\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/bst_validate/bst_validate_challenge.ipynb