      "        return sorted_stack\n",
      "\n",
      "    def test_sort_stack(self):\n",
      "        print('Test: Empty stack')\n",
      "        sorted_stack = self.get_sorted_stack([])\n",
      "        assert_equal(sorted_stack.pop(), None)\n",
      "\n",
      "        print('Test: One element stack')\n",
      "        sorted_stack = self.get_sorted_stack([1])\n",
      "        assert_equal(sorted_stack.pop(), 1)\n",
 
</s>
    "        sorted_stack = self.get_sorted_stack(stack, [])\n",
      "        return sorted_stack\n",
      "\n",
      "    def test_sort_stack(self):\n",
      "        print('Test: Empty stack')\n",
    "        sorted_stack = self.get_sorted_stack(stack, [])\n",
      "        assert_equal(sorted_stack.pop(), None)\n",
      "\n",
      "        print('Test: One element stack')\n",
      "        sorted_stack = self.get_sorted_stack([1])\n",
      "        assert_equal(sorted_stack.pop(), 1)\n",
keep keep keep keep replace keep keep keep keep keep
 Add intermediate sort stack solution and test
stacks_queues/sort_stack/sort_stack_solution.ipynb