mocha - Node.js下异步调用失效

Question

业务代码如下：

"use strict";

var request = require('request')

var A = function () {
    this.a = function () {
        var op = {
            url: 'www.test.com'
            ...
        }
        request(op, function(err, res, data){
            console.log('request OK')
            console.log(data);
        })

    }
};

module.exports = A;

对应的单元测试代码如下：

var should = require('chai').should();
var A = require('../../lib/A');

var test = new A();

describe('A test', function () {
    it('test', function () {
        test.a();
    })
});

我期望它应该能够输出request OK和data，但是实际上mocha在进行单元测试的时候没有任何输出就直接通过了。
这里的异步调用为什么没有正常进行呢？

---

mocha参数为mocha --recursive

Answer 1

Thank you for the invitation.

A.a();According to what you mean, it should be test.a();

Explain that before the constructor is instantiated, its own properties are the private properties of the function object and cannot be accessed from the outside.

---

Update

This is an asynchronous test case, add a timeout setting or impose a callback.

--recursive This parameter is only used to recursively execute subtests in the current directory

mocha -t 10000 test.js

or

describe('A test', function () {
    it('test', function (done) {
        test.a(function(){
            done();
         });
    })
});

// A function
    this.a = function (cb) {
        var op = {
            url: 'www.test.com'
            ...
        }
        request(op, function(err, res, data){
            console.log('request OK')
            console.log(data);
            if(typeof cb === 'function') cb();
        })

    }

Answer 2

If I remember correctly, the most test cases for mocha are 2000ms. When testing asynchronous examples, try adding -t and -timeout. A student rarely writes unit tests. . .