在5000毫秒的超时时间内未调用异步回调

本文介绍了在5000毫秒的超时时间内未调用异步回调的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在编写一个小型测试，以检查是否某些代码确实写入了我的mongo数据库.我收到来自Jest的以下错误消息，该代码确实有效.

I am writing a small test for checking if some code does write into my mongo database. I am receiving the following error message from Jest, the code does indeed work.

Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout.Error: Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout.

对于我的测试，我只调用函数并期望一个对象属性，该属性指定操作是否成功

For my test I am only calling the function and expecting a object property which specifies if the operation was succesfull

const {clearDataBase, loadData} = require('../src/utils/dataloader')

beforeEach(clearDataBase)
test('Should write all data into database', () => {
    jest.setTimeout(30000);
    const result = loadData()
    expect(result.status).toBe(201)
})

原始函数解析JSON文件并将某些参数保存到数据库中:

The original function parses a JSON file and saves certain pars into the database :

const loadData = () => {
    try{
        request(url, async (err, res, body) => {
            const data = JSON.parse(body)
            // ... Loads a lot of data, removed for this post only!
        })
        return { error: undefined, status: 201 }
    } catch(e){
        return { error: e, status: undefined }
    }
}

推荐答案

您应该使用Promises来确保仅在执行loadData函数之后才调用expect().笑话异步文档

You should use Promises to make sure that expect() is called only after loadData function is executed.Jest Async doc

在下面修改了您的代码以使用promises

Modified your code below to use promises

const {clearDataBase, loadData} = require('../src/utils/dataloader')

beforeEach(clearDataBase)
test('Should write all data into database', () => {
    jest.setTimeout(30000);
    loadData().then(result => expect(result.status).toBe(201));
})


const loadData = () => new Promise((resolve, reject) => {
  return request(url, async (err, res, body) => {
    if (err) return reject({error: err})
    const data = JSON.parse(body)
    // ... Loads alot of data, removed for this post only!
    return resolve({ error: undefined, status: 201 })
  })
})

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