Mocha测试不能与Webpack和mocha-loader一起运行 [英] Mocha tests don't run with Webpack and mocha-loader
问题描述
我正在将一些npm脚本移植到Webpack加载程序中，以更好地了解Webpack的工作方式，并且除了Mocha测试之外，我已经完成了所有工作:我的测试失败了，但没有显示Mocha正在使用mocha-loader或测试失败:
I am porting some npm scripts to Webpack loaders to better learn how Webpack works and I’ve got everything working except for my Mocha tests: I have one failing test, but it is not showing that Mocha is being run with the mocha-loader or that the test is failing:
要使所有src/**/*.test.js文件与Webpack中的Mocha一起运行，我需要做些什么?
What do I need to do differently to get all src/**/*.test.js files to run with with Mocha in Webpack?
- 克隆 https://github.com/trevordmiller/webpack-loaders-playground
- 运行
npm test以查看测试应如何工作 - 运行
npm run dev以查看测试如何不与Webpack一起运行
- Clone https://github.com/trevordmiller/webpack-loaders-playground
- Run
npm testto see how tests should work - Run
npm run devto see how tests don't run with Webpack
推荐答案
Mocha加载程序在构建时不会运行测试，它用于创建一个专门包含测试的包，然后可以从浏览器运行该包.
Mocha loader won't run tests while building, it's used to create a bundle specifically containing your tests which you can then run from your browser.
我建议为测试创建一个单独的webpack配置文件，然后将其托管在使用与应用程序不同端口的webpack-dev-server上.这是一个示例，它或多或少是我在自己的项目中使用的模式(撰写此答案时):
I would recommend creating a separate webpack config file for your tests, which you can then host on a webpack-dev-server that uses a different port from your application. Here's an example that's more-or-less the pattern that I use for my own projects (as of writing this answer):
module.exports = {
entry: 'mocha!./tests/index.js',
output: {
filename: 'test.build.js',
path: 'tests/',
publicPath: 'http://' + hostname + ':' + port + '/tests'
},
module: {
loaders: [
{
test: /\.js$/,
loaders: ['babel-loader']
},
{
test: /(\.css|\.less)$/,
loader: 'null-loader',
exclude: [
/build/
]
},
{
test: /(\.jpg|\.jpeg|\.png|\.gif)$/,
loader: 'null-loader'
}
]
},
devServer: {
host: hostname,
port: port
}
};
tests/index.js
// This will search for files ending in .test.js and require them
// so that they are added to the webpack bundle
var context = require.context('.', true, /.+\.test\.js?$/);
context.keys().forEach(context);
module.exports = context;
package.json
"scripts": {
"test": "find ./ -name '*.test.js' | xargs mocha -R min -r babel/register",
"devtest": "webpack-dev-server --config webpack.tests.config.js",
"dev": "webpack-dev-server --config webpack.config.js"
}
test.html
<!DOCTYPE html>
<html>
<head>
<title>Mocha</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="./node_modules/mocha/mocha.css" />
<script src="/tests/test.build.js"></script>
</head>
<body>
</body>
</html>
然后运行npm run devtest，打开http://localhost:<port you picked>/webpack-dev-server/test.html，然后mocha应该运行您的测试.
Then run npm run devtest, open http://localhost:<port you picked>/webpack-dev-server/test.html, and mocha should run your tests.
如果您不需要通过模块的CSS/LESS或图像，则可以从webpack.tests.config.js中删除这些加载器.
If you don't require CSS/LESS or images through your modules, you can remove those loaders from webpack.tests.config.js.
启用热加载后，这是一个非常不错的设置，因为我可以同时在不同的浏览器选项卡中运行我的应用程序和测试，然后更新代码并查看更改并立即重新运行测试.
With hot loading enabled this is a really great setup because I can have both my application and my tests running in different browser tabs, then update my code and see my changes and my tests re-running immediately.
您还可以运行npm run test以通过命令行执行相同的测试.
You can also run npm run test to execute the same tests through the command line.
希望这会有所帮助.
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