在5000毫秒的超时时间内未调用异步回调 [英] Async callback was not invoked within the 5000ms timeout

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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