测试失败：
Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.
所以我添加this.timeout(0)了它，然后我得到了：
Disconnected, because no message in 10000 ms.
我继续添加browserNoActivityTimeout: 0到我的配置文件中。
当我尝试运行测试时，浏览器打开并且控制台显示通过的测试。
成功
跳过 0 次测试
为什么浏览器没有关闭？它在等什么？
browserNoActivityTimeout
Karma 在与浏览器断开连接之前将等待来自浏览器的消息多长时间（以毫秒为单位）。
命令：
karma start --single-run
配置：
webpackConfig.module.loaders.push({
test: /\.js$/,
include: /src/,
exclude: /node_modules/,
loader: 'isparta'
});
var karmaConfig = {
frameworks: ['mocha'],
browsers: ['Chrome'],
//browserNoActivityTimeout: 0,
logLevel: 'INFO',
//reporters: ['progress', 'coverage-allsources', 'coverage'],
reporters: ['progress', 'coverage'],
autoWatch: true,
files: [
'test/karma.js'
],
urlRoot: '/karma-runner/',
preprocessors: {
'test/karma.js': ['webpack', 'sourcemap']
},
webpackMiddleware: {
stats: 'minimal',
watchOptions: {
aggregateTimeout: 300
}
},
webpack: webpackConfig,
coverageReporter: {
dir: 'report/coverage',
include: 'src/**/*.js',
// Any .js files that are not imported/required need to be added to the
// exclude:, otherwise you will get a JS error for
// 'Unexpected token in esprima.js'.
// This appears to be a bug with the karma-coverage-allsources repo.
exclude: 'src/init.js',
reporters: [
{'type' : 'cobertura'},
{'type' : 'html'},
{'type': 'text-summary'}
]
}
};