试图在摩卡咖啡中使用异步/等待



我想在摩卡咖啡中使用异步/等待我的测试。我读了很多帖子,但没有找到解决方案。我已经安装了所有Babel模块以转换代码,但它不起作用。

这是我的"测试"文件夹中的代码:

import test from 'mocha'
import 'babel-polyfill'
import { expect } from 'chai'
import { assert } from 'chai'
import utils from '../lib/utils'
describe('long number', function () {
  it("Sample", mochaAsync(async () => {
    var x = utils.longNums(0);
    expect(x).to.equal(5000);
  }))
})

这是我的软件包。我在哪里使用我要安装的所有babel依赖和插件,以及我建议使用摩卡咖啡的测试脚本来使用babel transpliting

   {
     "name": "pos_lisa-test",
     "version": "1.0.0",
     "description": "pos lisa test",
     "main": "index.js",
     "scripts": {
       "test": "mocha --compilers js:babel-core/register ./src/**/*.test.js"
     },
     "standard": {
       "parser": "babel-eslint"
     },
     "babel": {
       "presets": [
         "es2015",
         "react"
       ]
     },
     "keywords": [
       "test"
     ],
     "author": "Mauricio",
     "license": "MIT",
     "devDependencies": {
       "babel-core": "^6.23.1",
       "babel-eslint": "^7.1.1",
       "babel-plugin-transform-async-to-generator": "^6.22.0",
       "babel-preset-es2015": "^6.22.0",
       "babel-preset-react": "^6.23.0",
       "chai": "^3.5.0",
       "mocha": "^3.2.0",
     },
     "plugins": [
       "transform-async-to-generator"
     ],
     "dependencies": {
       "babel-polyfill": "^6.23.0"
     }
   }

我得到的错误是以下

it('should remove items that don't evaluate to true when passed to predicate function', async function () {
                                                                                           ^^^^^
SyntaxError: missing ) after argument list

我做错了什么?预先感谢您的帮助

您已将"plugins": ["transform-async-to-generator"]"添加到package.json的顶级,但应在"babel"部分内。将其更改为:

"babel": {
  "presets": [
    "es2015",
    "react"
  ],
  "plugins": [
    "transform-async-to-generator"
  ]
},

根据javaScript的道,"代码在此刻流动,因此知识只是一个提示,就像流的地图一样。"

截至2017年4月,拥有"转换-Async-to-generator"实际上会引起问题。

更一般的说明,每个async函数都会返回承诺,或者将其返回值和异常归咎于承诺。测试承诺并且没有测试呼叫await通常是更干净的:

it('should have no drops left', () => 
  ocean.listDrops().should.eventually.have.length(0));

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