karma.conf.js

// Karma configuration

var webpack = require("webpack");

module.exports = function(config) {
  config.set({

	// base path, that will be used to resolve files and exclude
	basePath: '',

    client: {
        mocha: {
            reporter: 'html', // change Karma's debug.html to the mocha web reporter
        }
    },

	// frameworks to use
	frameworks: ['mocha'],


	// list of files / patterns to load in the browser
	files: [
	  'test/index.js'
	],

	// list of preprocessors
	preprocessors: {
	  'test/*': ['webpack']
	},

	webpack: {
		resolve: {
			extensions: ["", ".js"]
		},
		module: {
			loaders: [
				{ test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" }
			]
		}
	},

	webpackMiddleware: {
        noInfo: true,
		stats: {
			colors: true
		}
	},

	// test results reporter to use
	// possible values: 'dots', 'progress', 'junit', 'growl', 'coverage'
	reporters: ['spec'],

	// 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: true,

	// Start these browsers, currently available:
	// - Chrome
	// - ChromeCanary
	// - Firefox
	// - Opera (has to be installed with `npm install karma-opera-launcher`)
	// - Safari (only Mac; has to be installed with `npm install karma-safari-launcher`)
	// - PhantomJS
	// - IE (only Windows; has to be installed with `npm install karma-ie-launcher`)
	browsers: ['ChromeCanary'],

	// If browser does not capture in given timeout [ms], kill it
	captureTimeout: 60000,

	// Continuous Integration mode
	// if true, it capture browsers, run tests and exit
	singleRun: false,

	// List plugins explicitly, since autoloading karma-webpack
	// won't work here
	plugins: [
		require("karma-mocha"),
		require("karma-spec-reporter"),
		require("karma-chrome-launcher"),
		require("karma-webpack")
	]
  });
};