      "\n",
      "        print('Success: test_trie')\n",
      "\n",
      "\n",
      "def main():\n",
      "    test = TestTrie()\n",
      "    test.test_trie()\n",
 
</s> remove     "    test.test_trie_remove_invalid()\n",
 </s> add     "    test.assertRaises(KeyError, test.test_trie_remove_invalid)\n", </s> remove     "        assert_true(trie.remove('foo') is None) \n",
 </s> add     "        self.assertTrue(trie.remove('foo') is None) \n", </s> remove     "            assert_true(trie.find(word) is None)\n",
 </s> add     "            self.assertTrue(trie.find(word) is None)\n", </s> remove     "        assert_equal(bst.find_second_largest(), node7)\n",
 </s> add     "        self.assertEqual(bst.find_second_largest(), node7)\n",
    "    def test_trie_remove_invalid(self):\n",
    "        print('Test: Remove from empty trie')\n",
    "        trie = Trie()\n",
    "        self.assertTrue(trie.remove('foo') is None) \n",
    "\n",
      "\n",
      "        print('Success: test_trie')\n",
      "\n",
    "    def test_trie_remove_invalid(self):\n",
    "        print('Test: Remove from empty trie')\n",
    "        trie = Trie()\n",
    "        self.assertTrue(trie.remove('foo') is None) \n",
    "\n",
      "\n",
      "def main():\n",
      "    test = TestTrie()\n",
      "    test.test_trie()\n",
keep keep add keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/trie/trie_challenge.ipynb