     "metadata": {},
     "source": [
      "## Test Cases\n",
      "\n",
      "* None -> None\n",
      "* Empty input -> []\n",
      "* One element -> [element]\n",
      "* Two or more elements"
     ]
    },
 
</s>
    "* None -> Exception\n",
     "metadata": {},
     "source": [
      "## Test Cases\n",
      "\n",
    "* None -> Exception\n",
      "* Empty input -> []\n",
      "* One element -> [element]\n",
      "* Two or more elements"
     ]
    },
keep keep keep keep replace keep keep keep keep keep
 Update insertion sort challenge (#129)

Update constraints, test cases, code, and tests.
sorting_searching/insertion_sort/insertion_sort_solution.ipynb