Javascript JS Jest模拟-预期收到未定义错误

我有一个使用

axios

获取数据的代码

const axios = require('axios');

class Users {
     static async all() {
        let res = await axios.get('http://localhost:3000/users');
        return res.data;
      }
}

module.exports = Users;

这应该用Jest框架进行测试

const axios = require('axios');
const Users = require('./users');

jest.mock('axios');

test('should fetch users', () => {

    const users = [{
        "id": 1,
        "first_name": "Robert",
        "last_name": "Schwartz",
        "email": "rob23@gmail.com"
    }, {
        "id": 2,
        "first_name": "Lucy",
        "last_name": "Ballmer",
        "email": "lucyb56@gmail.com"
    }];

    const resp = { data : users };

    // axios.get.mockResolvedValue(resp);
    axios.get.mockImplementation(() => Promise.resolve(resp));

    // console.log(resp.data);

    return Users.all().then(resp => expect(resp.data).toEqual(users));
});

这项测试失败了

expect(received).toEqual(expected)

Expected: [{"email": "rob23@gmail.com", "first_name": "Robert", "id": 1, "last_name": "Schwartz"}, {"email": "lucyb56@gmail.com", "first_name": "Lucy", "id": 2, "last_name": "Ballmer"}]
Received: undefined

实际数据是：

{ "users": [
    {
        "id": 1,
        "first_name": "Robert",
        "last_name": "Schwartz",
        "email": "rob23@gmail.com"
    },
    {
        "id": 2,
        "first_name": "Lucy",
        "last_name": "Ballmer",
        "email": "lucyb56@gmail.com"
    }
...
]
}

我想这可能是命名/未命名JSON数组的问题。

---

如何修复它？

看起来这只是一个简单的错误

您正在从

Users.all（）

返回

resp.data

，因此不必在

expect

中检查

resp.data

，只需检查

resp

：

return Users.all().then(resp => expect(resp).toEqual(users));  // SUCCESS

未实现mockImplementation（）函数