karma.conf.js

var webpack = require('webpack');
module.exports = function(config) {
    config.set({

        files: [
            // all files ending in 'test'
            './node_modules/phantomjs-polyfill/bind-polyfill.js',
            'test/test.js'
            // each file acts as entry point for the webpack configuration
        ],

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

        preprocessors: {
            // only specify one entry point
            // and require all tests in there
            'test/test.js': ['webpack']
        },

        reporters: ['spec', 'coverage'],

        coverageReporter: {
            type: 'html',
            dir: 'coverage/'
        },

        webpack: {
            // webpack configuration
            module: {
                loaders: [
                    { test: /\.js$/, loaders: ['babel-loader'], exclude: /node_modules/ }
                ],
                postLoaders: [{
                    test: /\.js/,
                    exclude: /(test|node_modules)/,
                    loader: 'istanbul-instrumenter'
                }]
            },
            resolve: {
                modulesDirectories: [
                    '',
                    'src',
                    'node_modules'
                ]
            }
        },

        webpackMiddleware: {
            // webpack-dev-middleware configuration
            noInfo: true
        },

        browsers: ['PhantomJS']
    });
};