      "class TestQuickSort(object):\n",
      "    def test_quick_sort(self, func):\n",
      "        print('Empty input')\n",
      "        data = []\n",
      "        func(data)\n",
      "        assert_equal(data, [])\n",
      "\n",
      "        print('One element')\n",
      "        data = [5]\n",
      "        func(data)\n",
      "        assert_equal(data, [5])\n",
 
</s> remove     "        func(data)\n",
    "        assert_equal(data, [])\n",
 </s> add     "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [])\n", </s> remove         func(data)
        assert_equal(data, [])
 </s> add         sorted_data = func(data)
        assert_equal(sorted_data, []) </s> remove     "        func(data)\n",
    "        assert_equal(data, [5])\n",
 </s> add     "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [5])\n", </s> remove     "        func(data)\n",
    "        assert_equal(data, [5])\n",
 </s> add     "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [5])\n", </s> remove     "        data = func(data)\n",
    "        assert_equal(data, sorted(data))\n",
 </s> add     "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, sorted(data))\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [])\n",
      "class TestQuickSort(object):\n",
      "    def test_quick_sort(self, func):\n",
      "        print('Empty input')\n",
      "        data = []\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [])\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [])\n",
      "\n",
      "        print('One element')\n",
      "        data = [5]\n",
      "        func(data)\n",
      "        assert_equal(data, [5])\n",
keep keep keep keep replace replace keep keep keep keep keep
 Fixed #23: Quicksort unit tests aren't correctly testing the returned value from quick_sort. 
sorting_searching/quick_sort/quick_sort_challenge.ipynb