[英]Unit test interceptor logic in Axios
我在 Axios 中设置了一个拦截器,它会刷新令牌,然后在初始 HTTP 响应是 401 时重试调用。
我试图通过模拟 Axios 请求返回 401 和有效响应(参见下面的简化版本)并断言它被调用两次来对这个逻辑进行单元测试。
我的问题是,因为我在嘲笑请求,拦截器似乎没有运行。 我没有重试请求, stubAuthError
返回了stubAuthError
。
有什么方法可以实现我所追求的目标,还是有更好的方法来测试它?
索引.js
const axios = require('axios');
axios.interceptors.response.use(
response => response,
error => {
const status = error.response ? error.response.status : null;
if (status === 401) {
return makeRequest();
} else {
return Promise.reject(error);
}
}
);
async function makeRequest() {
return axios.request('url');
}
module.exports = {
makeRequest
};
index.spec.js
const axios = require('axios');
const { makeRequest } = require('./index');
const stubAuthError = { response: { status: 401 } };
const stubResponse = { data: { foo: 'bar' } };
it('should make the request twice', async () => {
expect.assertions(1);
axios.request = jest.fn();
axios.request
.mockRejectedValueOnce(stubAuthError)
.mockResolvedValueOnce(stubResponse);
try {
await makeRequest();
} catch (error) {}
expect(axios.request).toHaveBeenCalledTimes(2);
});
拦截器是按顺序注册的,类似于express中间件,
您可以访问axios.interceptors.request
和axios.interceptors.response
到拦截器管理器上注册的单元测试函数
例如:
在我的main.js
:
let axios = require('axios');
axios.interceptors.response.use(
response => response,
error => {
const status = error.response ? error.response.status : null;
if (status === 401) {
return makeRequest();
} else {
return Promise.reject(error);
}
}
);
async function makeRequest() {
return axios.request('https://randomuser.me/api/');
}
module.exports = {
makeRequest
};
在我的main.test.js
:
let axios = require('axios');
//
// based on your question, we don't want to test "makeRequest"
// so, I'm loading the file only to register the interceptors
//
require('./main');
let stubAuthError = { response: { status: 401 } };
let stubExceptionError = { response: { status: 500 } };
let stubResponse = { data: { foo: 'bar' } };
test("interceptor fulfilled", () => {
let res = axios.interceptors.response.handlers[0].fulfilled(stubResponse);
expect(res).toEqual(stubResponse);
});
test("interceptor rejected => makeRequest", () => {
let originalAxiosRequest = axios.request;
// this fn will be called by "makeRequest"
axios.request = jest.fn();
axios.interceptors.response.handlers[0].rejected(stubAuthError);
expect(axios.request).toHaveBeenCalledTimes(1);
axios.request = originalAxiosRequest;
});
test("interceptor rejected => exception", async () => {
await expect(axios.interceptors.response.handlers[0].rejected(stubExceptionError)).rejects.toEqual(stubExceptionError)
});
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