      "        assert_equal(sorted_data, [5])\n",
      "\n",
      "        print('Two or more elements')\n",
      "        data = [5, 1, 7, 2, 6, -3, 5, 7, -1]\n",
      "        sorted_data = merge_sort(data)\n",
      "        assert_equal(sorted_data, sorted(data))\n",
      "\n",
      "        print('Success: test_merge_sort')\n",
      "\n",
      "\n",
      "def main():\n",
 
</s>
    "        assert_equal(merge_sort.sort(data), sorted(data))\n",
      "        assert_equal(sorted_data, [5])\n",
      "\n",
      "        print('Two or more elements')\n",
      "        data = [5, 1, 7, 2, 6, -3, 5, 7, -1]\n",
    "        assert_equal(merge_sort.sort(data), sorted(data))\n",
    "        assert_equal(merge_sort.sort(data), sorted(data))\n",
      "\n",
      "        print('Success: test_merge_sort')\n",
      "\n",
      "\n",
      "def main():\n",
keep keep keep keep replace replace keep keep keep keep keep
 Update merge sort challenge (#130)

Update constraints, test cases, code, and tests.
sorting_searching/merge_sort/merge_sort_solution.ipynb