Mocha-Express 单元测试以 localhost 作为 URL 失败

Question

我编写了以下脚本（server.js）：

var express = require('express'),
    app = express(),
    server;

app.get('/', function (request, response) {
  response.send('This is the main page.\n');});

exports.listen = function (port){
    server = app.listen(port, function () {
    console.log('Server available listening at: ' + port);}) };

exports.close = function () {
  server.close(function (){
    console.log('Server Closed')}); };

以及以下 Mocha 单元测试（test.js）：

var server = require ('./server'),
    assert = require ('assert'),
    http = require ('http');
var port = 8085;

describe('server', function () {
  before(function () {
    server.listen(port)});

  after(function () {
    server.close();}); });

describe('Server status and Message', function () {
  it('status response should be equal 200', function (done) {
    http.get('http://127.0.0.1:8085', function (response) {
         assert.equal(response.statusCode, 200);
        done(); }); }); }); 

当我运行 test.js 将“localhost:8085”或“127.0.0.1:8085”传递给 http 客户端时，无论端口如何，Mocha 都会显示以下错误：

1) Server status and Message status response should be equal 200:
     Uncaught Error: connect ECONNREFUSED
      at exports._errnoException (util.js:746:11)
      at TCPConnectWrap.afterConnect [as oncomplete] (net.js:983:19)

但我可以通过 http 客户端使用相同的 localhost url (listener.js) 完美地连接服务器：

var server = require('./server');
var http = require('http');

    var url = 'http://localhost:8085';
    var content = function(response){
        response.setEncoding("utf8");       
        response.on("data", function(data) {
                console.log(data)});}

    server.listen(8085);
    setTimeout(function (){server.close();}, 3000)

    http.get(url, content);

我已尝试使用其他互联网网址作为“https://www.google.com.co/”运行单元测试（测试未通过但有效）并且测试运行正常。

你能帮我解决这个问题吗？非常感谢。

Answer 1

您不小心运行了两组测试。将第二个 describe() 移到第一个内部，这样它就可以依赖 before() 钩子，如下所示：

var server = require ('./server'),
    assert = require ('assert'),
    http = require ('http');
var port = 8085;

describe('server', function () {
    before(function () {
        server.listen(port);
    });

    after(function () {
        server.close();
    });

    describe('Server status and Message', function () {
      it('status response should be equal 200', function (done) {
            http.get('http://127.0.0.1:8085', function (response) {
                  assert.equal(response.statusCode, 200);
                  done();
            });
       });
    });
});