Chai response.body 总是空的 {}

Question

无论我的服务器实际上是什么 returns，当我断言 response.body:

时，Chai 总是给我这个异常

Uncaught AssertionError: expected {} to deeply equal 'test'

即使实际的服务器响应是 'test'，而不是 {}：

这是我的测试：

const chai = require('chai');
const chaiHttp = require('chai-http');
const server = require('./test-server');
const should = chai.should();    
chai.use(chaiHttp);

describe('GET /test', () => {
  it('it should give test result', (done) => {
    chai.request(server)
        .get('/test')
        .end((err, res) => {
            console.log(err); // outputs null
            console.log(res); // outputs normal-looking response
            res.body.should.be.eql('test');
            done();
        });
  });
});

这是我的服务器（测试-server.js）：

const http = require('http');
const server = http.createServer(function (request, response) {
    response.writeHead(200, {"Content-Type": "text/plain"});
    response.end('test');
});

module.exports = server;

server.listen(process.env.PORT || 8000);
console.log("Server running at http://localhost:8000/");

我做错了什么？

Answer 1

Content-Type: application/json

res.body 根据 Content-Type header

填充

test-server.js

const http = require('http');
const server = http.createServer(function (request, response) {
    response.writeHead(200, {"Content-Type": "application/json"});

    var b = JSON.stringify({
      name: 'asad',
      class: 'paewe'
    });

    response.end(b);
});

module.exports = server;

server.listen(process.env.PORT || 8000);
console.log("Server running at http://localhost:8000/");

res.body 将包含已解析的 object

test.js

const chai = require('chai');
const chaiHttp = require('chai-http');
const server = require('./test-server');
const should = chai.should();
chai.use(chaiHttp);

describe('GET /test', () => {
    it('it should give test result', (done) => {
        chai.request(server)
            .get('/test')
            .end((err, res) => {
                console.log(err); // outputs null
                console.log(res); // outputs normal-looking response
                console.log(res.body) // { name: 'asad', class: 'paewe' }

                var checkObj = {
                    name: 'asad',
                    class: 'paewe'
                }
                res.body.should.be.eql(checkObj); // passes test
                done();
            });
    });
});

-------------------------------------------- ---------------------------------------------- --------

Content-Type: text/plain

如果 Content-Type header 是 text/plain，则响应 body 不会被解析为任何内容，但 res.text 将包含数据作为字符串

test-server.js

const http = require('http');
const server = http.createServer(function (request, response) {
    response.writeHead(200, {"Content-Type": "text/plain"});
    response.end('test');
});

module.exports = server;

server.listen(process.env.PORT || 8000);
console.log("Server running at http://localhost:8000/");

test.js

const chai = require('chai');
const chaiHttp = require('chai-http');
const server = require('./test-server');
const should = chai.should();    
chai.use(chaiHttp);

describe('GET /test', () => {
  it('it should give test result', (done) => {
    chai.request(server)
        .get('/test')
        .end((err, res) => {
            console.log(err); // outputs null
            console.log(res); // outputs normal-looking response
            console.log(res.body) // {}
            res.text.should.be.eql('test'); // passes test
            done();
        });
  });
});

一些参考文献

1. https://github.com/visionmedia/superagent/issues/990
2. https://github.com/visionmedia/supertest/pull/10
3. https://github.com/visionmedia/supertest/issues/68