Chai&amp；Mocha：测试停止Express服务器侦听

问题描述

我使用chai编写测试。以下仅是三个测试示例：

(实际还有更多测试，请查看链接的epl)

文件：tests/2_functional-tests.js

const chaiHttp = require('chai-http');
const chai = require('chai');
const assert = chai.assert;
const app = require('../app');

chai.use(chaiHttp);
const request = chai.request;

let id1;
let id2;

suite('Functional Tests', function() {
  test("Create an issue with every field: POST request to /api/issues/{project}", async () => {
    const res = await request(app)
    .post("/api/issues/testproject")
    .set('content-type', 'application/x-www-form-urlencoded')
    .send({
      issue_title: "Test issue",
      issue_text: "Test issue text",
      created_by: "Chai func test nr 1",
      assigned_to: "nobody :P",
      status_text: "didn't even start"
    });
    assert.equal(res.status, 200);
    let responseObj = JSON.parse(res.res.text);
    assert.equal(responseObj.issue_title, "Test issue");
    assert.equal(responseObj.issue_text, "Test issue text");
    assert.equal(responseObj.created_by, "Chai func test nr 1");
    assert.equal(responseObj.assigned_to, "nobody :P");
    assert.equal(responseObj.status_text, "didn't even start");
    assert.isTrue(responseObj.open);

        id1 = responseObj._id;     
  });

  test("Create an issue with missing required fields: POST request to /api/issues/{project}", async () => {
    const res = await request(app)
      .post("/api/issues/testproject")
      .set('content-type', 'application/x-www-form-urlencoded')
      .send({
        issue_title: "Test issue 3", //no issue_text
        created_by: "Chai func test nr 3"
      });
    assert.equal(res.status, 200);
    let responseObj = JSON.parse(res.res.text);
    assert.equal(responseObj.error, "required field(s) missing")
  });

  test("View issues on a project with multiple filters: GET request to /api/issues/{project}", async () => {
    const res = await request(app)
      .get("/api/issues/testproject?open=true&created_by=Chai+func+test+nr+1")

    assert.equal(res.status, 200);
    let responseObj = JSON.parse(res.res.text);

    assert.equal(responseObj.length, 1);
    assert.equal(responseObj[0].issue_text, "Test issue text");
    assert.equal(responseObj[0].status_text, "didn't even start");
    assert.equal(responseObj[0].created_by, "Chai func test nr 1");
    assert.equal(responseObj[0].open, true);
  });
});

这些测试完全按照预期工作。我不要收到任何错误。尽管如此，这些测试会阻止我的Express服务器侦听。

我正在听，然后启动了测试跑步器： (在server.js文件中)

const listener = app.listen(process.env.PORT || 3000, function () {
  console.log('Your app is listening on port ' + listener.address().port);
  if (process.env.NODE_ENV === 'test') {
    console.log('Running Tests...');
    setTimeout(function () {
      try {
        runner.run();
      } catch (e) {
        console.log('Tests are not valid:');
        console.error(e);
      }
    }, 5000);
  }
});

当我启动服务器时，它会侦听，并且所有路由都可用。但是，在测试运行程序启动后，服务器停止侦听，路线也停止工作。但有趣的是，如果我删除测试，只运行空套件，如下所示：

const chaiHttp = require('chai-http');
const chai = require('chai');
const assert = chai.assert;
const app = require('../app');

chai.use(chaiHttp);
const request = chai.request;

let id1;
let id2;

suite('Functional Tests', function() {
});

...一切正常，服务器继续侦听。

runner.run位于test-runner.js文件中的emitter.run函数。

const analyser = require('./assertion-analyser');
const EventEmitter = require('events').EventEmitter;

const Mocha = require('mocha'),
    fs = require('fs'),
    path = require('path');

const mocha = new Mocha();
let testDir = './tests'


// Add each .js file to the mocha instance
fs.readdirSync(testDir).filter(function(file){
    // Only keep the .js files
    return file.substr(-3) === '.js';

}).forEach(function(file){
    mocha.addFile(
        path.join(testDir, file)
    );
});

let emitter = new EventEmitter();
emitter.run = function() {

  let tests = [];
  let context = "";
  let separator = ' -> ';
  // Run the tests.
  try {
  let runner = mocha.ui('tdd').run()
    .on('test end', function(test) {
        // remove comments
        let body = test.body.replace(///.*
|/*.**//g, '');
        // collapse spaces
        body = body.replace(/s+/g,' ');
        let obj = {
          title: test.title,
          context: context.slice(0, -separator.length),
          state: test.state,
          // body: body,
          assertions: analyser(body)
        };
        tests.push(obj);
    })
    .on('end', function() {
        emitter.report = tests;
        emitter.emit('done', tests)
    })
    .on('suite', function(s) {
      context += (s.title + separator);

    })
    .on('suite end', function(s) {
      context = context.slice(0, -(s.title.length + separator.length))
    })
  } catch(e) {
    throw(e);
  }
};

module.exports = emitter;

This is a project of the freecodecamp.org curriculum，而test-runner.js只是来自Starter项目，所以我没有碰它，我认为它没有什么问题。

可能是什么问题？会不会是代码结构有严重错误？

Here is a link to the project on replit - Feel free to fork

-测试前：

-测试后：

推荐答案

看起来这是一个复制问题，如果我下载文件并在本地运行服务器，一切都可以无缝工作。

然而，here is an older version of the project，它仍然有错误，但它具有不同的结构。以防有人想看一眼。