我已经检查了几个选项如何验证响应，它仍然不工作，在我的情况下.正如你可以看到（调试采样器），为last_name正则表达式工作，我收到一些值，但如果我想重用这个响应作为“响应Assert”，测试失败，因为我收到“响应是空”.
JSON Extractor for last_name
Response assertion
Test failed
另外，我想计算“data”中的对象，所以我使用http://jsonpath.herokuapp.com/?path=$..book[0,1]来确保JSON文件是正确的。但是“Debug sampler”没有显示任何内容：（所以测试再次失败
Count of objectsResult打印机
请问有什么办法解决这个问题吗？
JSON格式：

{
"page": 2,
"per_page": 6,
"total": 12,
"total_pages": 2,
"data": [
    {
        "id": 7,
        "email": "michael.lawson@reqres.in",
        "first_name": "Michael",
        "last_name": "Lawson",
        "avatar": "https://reqres.in/img/faces/7-image.jpg"
    },
    {
        "id": 8,
        "email": "lindsay.ferguson@reqres.in",
        "first_name": "Lindsay",
        "last_name": "Ferguson",
        "avatar": "https://reqres.in/img/faces/8-image.jpg"
    },
    {
        "id": 9,
        "email": "tobias.funke@reqres.in",
        "first_name": "Tobias",
        "last_name": "Funke",
        "avatar": "https://reqres.in/img/faces/9-image.jpg"
    },
    {
        "id": 10,
        "email": "byron.fields@reqres.in",
        "first_name": "Byron",
        "last_name": "Fields",
        "avatar": "https://reqres.in/img/faces/10-image.jpg"
    },
    {
        "id": 11,
        "email": "george.edwards@reqres.in",
        "first_name": "George",
        "last_name": "Edwards",
        "avatar": "https://reqres.in/img/faces/11-image.jpg"
    },
    {
        "id": 12,
        "email": "rachel.howell@reqres.in",
        "first_name": "Rachel",
        "last_name": "Howell",
        "avatar": "https://reqres.in/img/faces/12-image.jpg"
    }
],