Mocha測試設置可運行兩個需要相同測試的測試

Question

我正在使用Spectron通過Mocha運行測試套件來測試Electron應用程序。 我正在嘗試完成兩個需要相同設置的測試，因此我使用beforeEach來實現重復的設置代碼。 前一個測試按預期成功運行，但是第二個測試提早兩次失敗，並顯示錯誤消息：

Error: An element could not be located on the page using the given search parameters.

如果添加睡眠功能，我已經達到了預期的效果，但是我寧願不這樣做，不知道這可能是什么問題？

const helpers = require('./global-setup')
var fs = require('fs')
var assert = require('assert')
const path = require('path');
var expect = require('chai').expect
//const chai = require('chai');

var describe = global.describe
var it = global.it
var beforeEach = global.beforeEach
var afterEach = global.afterEach


describe('Launch application', function () {
  helpers.setupTimeout(this)

  var app = null

  function snapshotOnError(picName) {
    console.log('taking error snapshot pic')
    app.browserWindow.capturePage().then(function (imageBuffer) {
      fs.writeFile(picName + '.png', imageBuffer)
    })
  }

  beforeEach(function () {
    return helpers.startApplication({
      args: [path.join(__dirname, '..')]
    }).then(function (startedApp) { app = startedApp });
  })

  afterEach(function () {
    return helpers.stopApplication(app)
  })

  describe('log into training mode', function() {
    beforeEach(function(done) {
      app.client.waitUntilWindowLoaded()
        .browserWindow.focus()
        .getWindowCount().should.eventually.equal(1)
        .browserWindow.isMinimized().should.eventually.be.false
        .browserWindow.isDevToolsOpened().should.eventually.be.false
        .browserWindow.isVisible().should.eventually.be.true
        .browserWindow.isFocused().should.eventually.be.true
        .click('//*[@id="js-side-nav"]/div[1]/ul/li[1]')
        .electron.clipboard.writeText('training')
        .click('#username')
        .webContents.paste()
        .waitForValue('#username', 1000)
        .electron.clipboard.writeText('12345')
        .click('#password')
        .webContents.paste()
        .waitForValue('#password', 1000)
        .click('//*[@id="main"]/section/div[2]/form/div[4]/button')
        .catch(function (err) {
          console.log('errorJ: ' + err)
          snapshotOnError('log_in_traning');
          //done(err)
        })
        .then(function() { done(); })
    })

    it('checks the text in left topbar menu', function() {
      return app.client
        .getText('#js-top-nav > div.nav-left > ul > li:nth-child(1) > span').should.eventually.equal('Actions')
        .getText('#js-top-nav > div.nav-left > ul > li.nav-news > span').should.eventually.equal('News')
        .getText('#js-top-nav > div.nav-left > ul > li:nth-child(3) > span').should.eventually.equal('Reports')
        .getText('#js-top-nav > div.nav-left > ul > li:nth-child(4) > span').should.eventually.equal('Settings')
        .getText('#js-activate-help-menu > span').should.eventually.equal('Help')
        done()
    })

    it('checks if icons in the top bar menu are present', function(){
      return app.client
        .isExisting('#js-top-nav > div.nav-left > ul > li:nth-child(1) > i').should.eventually.be.true
        .isExisting('#js-top-nav > div.nav-left > ul > li.nav-news > i').should.eventually.be.true
        .isExisting('#js-top-nav > div.nav-left > ul > li:nth-child(3) > i').should.eventually.be.true
        .isExisting('#js-top-nav > div.nav-left > ul > li:nth-child(4) > i').should.eventually.be.true
        .isExisting('#js-activate-help-menu').should.eventually.be.true
        done()
    })
  })
})

Answer 1

您不需要在第一個測試中顯式調用beforeEach掛鈎。

您的beforeEach掛鈎將在每個描述之前運行

測試運行器將自己運行該鈎子。