【发布时间】：2017-04-06 10:32:15
【问题描述】：
我有一个或多或少的香草 Laravel + Vue.js 应用程序，我正在尝试做一些 JS testing with Karma and Jasmine。如果我尝试在测试中使用 () => {} 样式函数或 const 之类的关键字，它们会因 Unexpected token 错误而失败，但是，我使用 import 关键字没有问题，我能够毫无问题地转译和处理 .vue 文件。
一个微不足道的断言，如
expect(true).toBe(true);
似乎工作正常（见最后一行）
$ ./node_modules/karma/bin/karma start
22 11 2016 11:09:23.250:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
22 11 2016 11:09:23.254:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
22 11 2016 11:09:23.263:INFO [launcher]: Starting browser PhantomJS
22 11 2016 11:09:24.025:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket /#U1dCZ7i3UtsC-M3_AAAA with id 84458811
PhantomJS 2.1.1 (Mac OS X 0.0.0): Executed 1 of 1 SUCCESS (0.004 secs / 0.002 secs)
那么，如果我在我的测试函数中添加一个简单的const 声明
const myVar = 1
expect(true).toBe(true);
我收到一个错误：
$ ./node_modules/karma/bin/karma start
22 11 2016 11:10:00.741:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
22 11 2016 11:10:00.745:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
22 11 2016 11:10:00.752:INFO [launcher]: Starting browser PhantomJS
22 11 2016 11:10:01.659:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket /#Gwh8ywcLStrKf-ljAAAA with id 78654911
PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR
SyntaxError: Unexpected token 'const'
at tests/unit/Example.spec.js:165
改为，如果我尝试导致语法错误
const = 1 // syntax error
expect(true).toBe(true);
然后 Babel 抱怨（在第一行，在 Karma 或 PhantomJS 启动之前）
22 11 2016 11:07:00.079:ERROR [preprocessor.babel]: /Users/crcarter/Software/CropPlanning/cps-php/resources/assets/js/tests/unit/Example.spec.js: Unexpected token (8:15)
at /Users/crcarter/Software/CropPlanning/cps-php/resources/assets/js/tests/unit/Example.spec.js
22 11 2016 11:07:00.090:INFO [karma]: Karma v1.3.0 server started at http://localhost:9876/
22 11 2016 11:07:00.091:INFO [launcher]: Launching browser PhantomJS with unlimited concurrency
22 11 2016 11:07:00.101:INFO [launcher]: Starting browser PhantomJS
22 11 2016 11:07:00.986:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket /#9Y6QLVxtJ57qRrgDAAAA with id 56249014
PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR
You need to include some adapter that implements __karma__.start method!
这似乎暗示 Example.spec.js 文件正在被 Babel 解析/转译，但转译后的版本并未正确传送到浏览器，即使 Example.vue 文件似乎已正确传送。
我该怎么做才能让const 和() => {} 之类的东西在我的测试中起作用？谢谢。
以下是相关文件：
resources/assets/js/components/Example.vue
resources/assets/js/tests/unit/Example.spec.js
karma.conf.js
package.json
// Example.vue
<template>
<div class="container">
</div>
</template>
<script>
export default {
mounted() {
console.log('Component ready.')
},
data() {
return { input: '# Hello!' }
}
}
</script>
// Example.spec.js
import Example from '../../components/Example.vue';
describe('Example', function () {
it('should set correct default data', function () {
const myVar = 1
// trivial assertions
expect(true).toBe(true);
});
});
// karma.conf.js
var path = require('path')
var basePath = './resources/assets/js/';
module.exports = function(config) {
config.set({
frameworks: ['jasmine'],
port: 9876,
logLevel: config.LOG_INFO,
autoWatch: true,
browsers: ['PhantomJS'],
singleRun: true,
basePath: basePath,
webpack: {
resolve: {
extensions: ['', '.js', '.vue'],
fallback: [path.join(__dirname, 'node_modules')],
},
resolveLoader: {
fallback: [path.join(__dirname, 'node_modules')]
},
module: {
loaders: [
{ test: /\.vue$/, loader: 'vue' },
{ test: /\.js$/, loader: 'babel',
include: basePath,
}
]
}
},
webpackMiddleware: {
noInfo: true,
stats: 'errors-only'
},
files: [
{ pattern: 'tests/**/*.spec.js', watched: false },
],
exclude: [],
preprocessors: {
'app.js': ['webpack', 'babel'],
'tests/**/*.spec.js': [ 'babel', 'webpack' ]
},
})
}
还有package.json
{
"private": true,
"scripts": {
"prod": "gulp --production",
"dev": "gulp watch"
},
"devDependencies": {
"bootstrap-sass": "^3.3.7",
"gulp": "^3.9.1",
"jquery": "^3.1.0",
"laravel-elixir": "^6.0.0-11",
"laravel-elixir-vue-2": "^0.2.0",
"laravel-elixir-webpack-official": "^1.0.2",
"lodash": "^4.16.2",
"vue": "^2.0.1",
"vue-resource": "^1.0.3"
},
"dependencies": {
"jasmine-core": "^2.5.2",
"karma": "^1.3.0",
"karma-babel-preprocessor": "^6.0.1",
"karma-chrome-launcher": "^2.0.0",
"karma-firefox-launcher": "^1.0.0",
"karma-jasmine": "^1.0.2",
"karma-phantomjs-launcher": "^1.0.2",
"karma-webpack": "^1.8.0"
}
}
【问题讨论】：
-
请尝试expect(true).to.equal(true);
-
在karma-babel-preprocessor docs 中它说：“从 Babel 6.0 开始，你需要告诉 Babel 要使用哪些功能”我不使用 webpack，但我看不到你在任何地方设置预设在您显示的代码中。
-
就像 craig 说的，babel 有不同阶段的 es6 支持，尝试在你的
.babelrc中使用es2015+stage-3，这种组合在我的情况下可以很好地转换。 -
感谢 cmets @craig_h 和 PanJunjie。我最终能够创建一个工作配置。如果您好奇，请参阅我的答案以了解详细信息。
标签： webpack karma-runner vue.js babeljs