      "    # method in addition to the following end-to-end test\n",
      "    def test_end_to_end(self):\n",
      "        print('Test: Empty stack')\n",
      "        stack = Stack()\n",
      "        assert_equal(stack.peek(), None)\n",
      "        assert_equal(stack.pop(), None)\n",
      "\n",
      "        print('Test: One element')\n",
      "        top = Node(5)\n",
      "        stack = Stack(top)\n",
      "        assert_equal(stack.pop(), 5)\n",
 
</s>
    "        self.assertEqual(stack.peek(), None)\n",
    "        self.assertEqual(stack.pop(), None)\n",
      "    # method in addition to the following end-to-end test\n",
      "    def test_end_to_end(self):\n",
      "        print('Test: Empty stack')\n",
      "        stack = Stack()\n",
    "        self.assertEqual(stack.peek(), None)\n",
    "        self.assertEqual(stack.pop(), None)\n",
    "        self.assertEqual(stack.peek(), None)\n",
    "        self.assertEqual(stack.pop(), None)\n",
      "\n",
      "        print('Test: One element')\n",
      "        top = Node(5)\n",
      "        stack = Stack(top)\n",
      "        assert_equal(stack.pop(), 5)\n",
keep keep keep keep replace replace keep keep keep keep keep
 #273: Remove nose dependency for stacks_queues/ (#276)
stacks_queues/stack/stack_solution.ipynb