1、安装依赖
npm install chai chai-http mocha nyc --save-dev
2、更新package.json
"scripts": {
"test": "nyc -a mocha --recursive",
},
3、创建test目录
mkdir test/test.js
目录结构：
/app
--/src
--/test
----test.js
--package.json
4、更新src/server.js
const express = require('express');
const app = express();
app.get('/', (req, res) => {
res.status(200).send('Hello World!');
});
app.get('/hello', (req, res) => {
res.status(200).send('Hello World!');
});
//404错误处理
app.use(function (req, res, next) {
res.status(404).send('Not Found');
});
module.exports = app.listen(port, () => {
console.log(`My app listening at http://localhost:${port}`);
});
5、更新test/test.js
let chai = require('chai');
let chaiHttp = require('chai-http');
let server = require('../src/server');
let should = chai.should();
chai.use(chaiHttp);
describe('Server', () => {
it('should respond status 200', (done) => {
chai
.request(server)
.get('/')
.end((err, res) => {
res.should.have.status(200);
done();
});
});
it('should GET the hello response', (done) => {
chai
.request(server)
.get('/hello')
.end((err, res) => {
res.should.have.status(200);
res.text.should.equal('Hello World!');
done();
});
});
it('should respond status 404', (done) => {
chai
.request(server)
.get('/wrongUrl')
.end((err, res) => {
res.should.have.status(404);
res.text.should.equal('Not Found');
done();
});
});
});
6、运行 npm run test
输出：
My app listening at http://localhost:3000
Server
✔ should respond status 200
✔ should GET the hello response
✔ should respond status 404
3 passing (37ms)
7、使用chai对express进行单元测试时报错 TypeError: app.address is not a function
错误信息：
My app listening at http://localhost:3000
Server
1) should respond status 200
2) should GET the hello response
3) should respond status 404
0 passing (17ms)
3 failing
1) Server
should respond status 200:
TypeError: app.address is not a function
at serverAddress (node_modules/chai-http/lib/request.js:282:18)
at new Test (node_modules/chai-http/lib/request.js:271:53)
at Object.obj.<computed> [as get] (node_modules/chai-http/lib/request.js:239:14)
at Context.<anonymous> (test/test.js:12:8)
at processImmediate (internal/timers.js:456:21)
如何解决：
在server.js的app.listen(port)前加上 module.exports =
app.listen(port, () => {
console.log(`My app listening at http://localhost:${port}`);
});
//改为
module.exports = app.listen(port, () => {
console.log(`My app listening at http://localhost:${port}`);
});
