Karma是Testacular的新名字，在2012年google开源了Testacular，2013年Testacular改名为Karma。Karma是一个让人感到非常神秘的名字，表示佛教中的缘分。这个名字和LOL中的扇子妈同名 - -，比较佛系。
On the AngularJS team, we rely on testing and we always seek better tools to make our life easier. That‘s why we created Karma - a test runner that fits all our needs.
Karma是一个基于Node.js的JavaScript测试执行过程管理工具（Test Runner）。该工具可用于测试所有主流Web浏览器，也可集成到CI（Continuous integration）工具，也可和其他代码编辑器一起使用。
可以生成报告和单测覆盖率检查。
Karma.conf.js
// Karma configuration // Generated on Thu Mar 22 2018 20:30:24 GMT+0800 (CST) module.exports = function(config) { config.set({ // base path that will be used to resolve all patterns (eg. files, exclude) basePath: '', // frameworks to use // available frameworks: https://npmjs.org/browse/keyword/karma-adapter frameworks: ['jasmine'], // list of files / patterns to load in the browser files: [ './unit/**/*.js', './unit/**/*.spec.js' ], // list of files / patterns to exclude exclude: [ ], //指定对应的JS文件 去执行代码的覆盖率 preprocessors: { './unit/**/*.js': ['coverage'] }, // test results reporter to use // possible values: 'dots', 'progress' // available reporters: https://npmjs.org/browse/keyword/karma-reporter reporters: ['progress', 'coverage'], coverageReporter: { type : 'html', dir : 'coverage/' }, // web server port port: 9876, // enable / disable colors in the output (reporters and logs) colors: true, // level of logging // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG logLevel: config.LOG_INFO, // enable / disable watching file and executing tests whenever any file changes autoWatch: false, // start these browsers // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher browsers: ['PhantomJS'], //黑窗小独立的运行环境 singleRun: true, // Concurrency level // how many browser should be started simultaneous concurrency: Infinity }) }