node.js - 尝试在 mocha 中使用 async/await

Question

我想在 mocha 中使用 async/await 来进行测试。我已经阅读了很多帖子，但我没有找到解决方案。我已经安装了所有的 babel 模块来转换代码，但它不起作用。

这是我在“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 package.json，我在其中使用了我必须安装的所有 babel 依赖项和插件，以及我建议 mocha 使用 babel 转译的测试脚本

   {
     "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"
     }
   }

我得到的错误如下

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？提前非常感谢您的帮助

Answer 1

您已将 "plugins": ["transform-async-to-generator"]" 添加到您的 package.json 的顶层，但它应该是在 "babel" 部分。将其更改为:

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