如何在茉莉花中测试私有函数

Question

我想测试在公共函数中调用的私有函数，如何访问私有函数内的代码。

{
"engineering": [
    {
        "schools": [
          {
            "id": 1,
            "name": "Amrita School of Engineering"
          },
        ],
        "location": "Kollam"
    },
    {
        "schools": [ 
          {
            "id": 3,
            "name": "Amrita School of Medicine"
          },
          {
            "id": 4,
            "name": "Amrita School of Engineering"
          }
        ],
        "location": "Kozhikode"
    }
],
"medicine": [{
        "schools": [
          {
              "id": 2,
              "name": "Amrita School of Medicine"
          },
        ],
        "location": "Kollam"
    },
]

如何在调用私有函数后测试“flag”的值是否已更改？我试图窥探privateFunction，但它给我的方法不存在错误。