TypeError：无法读取未定义的属性“关闭”

Question

我是 nodejs 和 koa 的新手。有一个现有的 Koa 应用程序（运行良好，没有问题），我正在尝试使用 Jest 编写测试代码。我已经搜索了可能适用于这种情况但无济于事的示例测试。现在，当我运行测试代码TypeError: Cannot read property 'close' of undefined 时出现此错误。我知道我从ret 启动server 变量有问题。

顺便说一句，console.log(ret) 返回undefined：

[nodemon] restarting due to changes...
[nodemon] starting `node index.js`
undefined
Mongoose default connection open to mongodb://localhost/giantsoftdata
Listening to port: 3000

这是我想用npm run test 测试的现有应用：

// index.js
const Koa = require('koa')
const KoaBodyParser = require('koa-bodyparser')
const KoaErrorHandler = require('@giansoft/lib-errors/lib/koaHandler')
const PORT = 3000
const app = new Koa()
const router = require('./api/rest/router')()
const dbconnect = require('./database')
const dbstatus = require('./database/dbstatus')

app
  .use(KoaErrorHandler)
  .use(dbstatus())
  .use(KoaBodyParser())

const ret = dbconnect( async function () {
  app
      .use(router.routes())
      .use(router.allowedMethods())
  app.listen(PORT, () => {
      console.log(`Listening to port: ${PORT}`)
  })
  return app;
})
// console.log(ret)
module.exports = ret;

这是我的测试代码：

// index.test.js
const server = require("../index");
const request = require("supertest");

afterEach(() => {
  server.close();
});

describe('routes: /status', () => {
  test('Should respond {Status : "Ok"}.', async () => {
    const response = await request(server).get('/status');
    expect(response.status).toEqual(200);
    expect(response.type).toEqual('application/json');
  });
});

这里是./database/index.js

const mongoose = require('mongoose')
const dbConfig = require('../config').db

const dbconnect = (callback) => {
  let connString = `mongodb://${dbConfig.host}`
  if (dbConfig.username && dbConfig.password) {
    connString = `mongodb://${dbConfig.username}:${dbConfig.password}@${dbConfig.host}`
  }

  mongoose.connect(connString, { useNewUrlParser: true, useCreateIndex: true })

  mongoose.connection.on('open', function () {
    callback()
  })

  mongoose.connection.on('connected', function () {
    console.log('Mongoose default connection open to ' + connString)
  })

  mongoose.connection.on('error', function (err) {
    console.log('Mongoose default connection error: ' + err)
  })

  mongoose.connection.on('disconnected', function () {
    console.log('Mongoose default connection disconnected')
  })

  process.on('SIGINT', function () {
    mongoose.connection.close(function () {
      console.log('Mongoose default connection closed through app termination')
      process.exit(0)
    })
  })
}

module.exports = (callback) => {
  dbconnect(callback)
}

Answer 1

更新文件 - ./database/index.js

const mongoose = require('mongoose')
const dbConfig = require('../config').db

const dbconnect = (callback) => {
  let connString = `mongodb://${dbConfig.host}`
  if (dbConfig.username && dbConfig.password) {
    connString = `mongodb://${dbConfig.username}:${dbConfig.password}@${dbConfig.host}`
  }

  mongoose.connect(connString, { useNewUrlParser: true, useCreateIndex: true })

  mongoose.connection.on('open', function () {
    callback()
  })

  mongoose.connection.on('connected', function () {
    console.log('Mongoose default connection open to ' + connString)
  })

  mongoose.connection.on('error', function (err) {
    console.log('Mongoose default connection error: ' + err)
  })

  mongoose.connection.on('disconnected', function () {
    console.log('Mongoose default connection disconnected')
  })

  process.on('SIGINT', function () {
    mongoose.connection.close(function () {
      console.log('Mongoose default connection closed through app termination')
      process.exit(0)
    })
  });
  return mongoose.connection;
}

module.exports = (callback) => {
  return dbconnect(callback)
}