如何使用node.js在jest中模拟传入的http请求?

Question

我正在制作一个名为handle_http.js的处理程序库:

module.exports.redirectHttpToHttps = (db,req,res)=>{
const sql = "SELECT * from redirect where use_in_http = 1 and exact_match = 1 and url_from = ? and exact_match=1 LIMIT 1";
// redirection logic
}

和我做了一个http服务器，消耗库:

const http = require('node:http');
// A simple database connection generator
const db = require('./db.js');
const handler = require('./handle_http.js');
http.createServer((req,res){
handler.redirectHttpToHttps(db,req,res);
});
http.listen(80);

但是在运行实际代码之前，我想使用jest(test_redirect.jest.js)做一些单元测试:

const db = require('../src/db.js');
const redirect = require('../src/handle_http.js');
test("redirect to https",()=>{
const dbHandler = db(':memory:');
database.exec(`
INSERT INTO redirect (url_from,url_to,method,http_status_code,use_in_http,exact_match) VALUES
('http://google.com/mytest','http://yahoo.com','GET',301,1,1),
('http://google.com/mytest2','http://yandex.com','GET',302,1,0),
('http://google.com?q=ikariam','http://yandex.com','GET',302,1,1),
('http://example.com/products','https://fakestoreapi.com/products','POST',308,1,1),
('http://example.net/products','https://fakestoreapi.com/products','POST',308,1,0),
('http://example.net','https://fakestoreapi.com/products','POST',308,1,0);
`,function(error){ err_callback(error); });

// need to make fake request so I can call the `redirectHttpToHttps`
redirect.redirectHttpToHttps(db,/*mocked_request*/,/*some way to assert the response*/)
});

正如您所看到的，我能够用假数据填充内存中的数据库，但我不知道如何:

1. 如何伪造一个传入的http请求
2. 我怎么能断言http响应有适当的状态码和头

提供的示例不适合我的情况，因为我需要在我自己的用nodejs编写的http服务器中测试http处理逻辑。

Answer 1

一种方法是使用超测试并动态创建http服务器:

const http = require('node:http');
const request = require('supertest');

const db = require('../src/db.js');
const redirect = require('../src/handle_http.js');
test("redirect to https",(done)=>{
const dbHandler = db(':memory:');
database.exec(`
INSERT INTO redirect (url_from,url_to,method,http_status_code,use_in_http,exact_match) VALUES
('http://google.com/mytest','http://yahoo.com','GET',301,1,1),
('http://google.com/mytest2','http://yandex.com','GET',302,1,0),
('http://google.com?q=ikariam','http://yandex.com','GET',302,1,1),
('http://example.com/products','https://fakestoreapi.com/products','POST',308,1,1),
('http://example.net/products','https://fakestoreapi.com/products','POST',308,1,0),
('http://example.net','https://fakestoreapi.com/products','POST',308,1,0);
`,function(error){ done(error); });

const server = http.createServer((req,res)=>{
redirect.redirectHttpToHttps(dbHandler,req,res)
});
request(server)
.get('/mytest')
.set('Host','google.com')
.expect(301,done);
});

注意以下句子:

request(server)
.get('/mytest')
.set('Host','google.com')
.expect(301,done);

使用来自supertest的request函数，我提供了一个不侦听任何端口的服务器实例:

const server = http.createServer((req,res)=>{
redirect.redirectHttpToHttps(dbHandler,req,res)
});

在测试期间，您可以完全避免https，并创建纯非ssl服务器，调用您想要执行的http处理函数。

---

Miscelanous h1> 样，你的代码在section有一个错误:

database.exec(`
INSERT INTO redirect (url_from,url_to,method,http_status_code,use_in_http,exact_match) VALUES
('http://google.com/mytest','http://yahoo.com','GET',301,1,1),
('http://google.com/mytest2','http://yandex.com','GET',302,1,0),
('http://google.com?q=ikariam','http://yandex.com','GET',302,1,1),
('http://example.com/products','https://fakestoreapi.com/products','POST',308,1,1),
('http://example.net/products','https://fakestoreapi.com/products','POST',308,1,0),
('http://example.net','https://fakestoreapi.com/products','POST',308,1,0);
`,function(error){ err_callback(error); });

函数err_callback没有定义。因此，我使用了文档

中定义的jest的done函数。所以测试的重构部分是:

database.exec(`
INSERT INTO redirect (url_from,url_to,method,http_status_code,use_in_http,exact_match) VALUES
('http://google.com/mytest','http://yahoo.com','GET',301,1,1),
('http://google.com/mytest2','http://yandex.com','GET',302,1,0),
('http://google.com?q=ikariam','http://yandex.com','GET',302,1,1),
('http://example.com/products','https://fakestoreapi.com/products','POST',308,1,1),
('http://example.net/products','https://fakestoreapi.com/products','POST',308,1,0),
('http://example.net','https://fakestoreapi.com/products','POST',308,1,0);
`,function(error){ done(error); });