karma.config.js

// Karma configuration

var webpackConf = require('./node_modules/laravel-mix/setup/webpack.config.js');
delete webpackConf.entry

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

        frameworks: ['jasmine'],

        port: 9876, // web server port

        colors: true,

        logLevel: config.LOG_INFO,

        reporters: ['progress'], // dots, progress

        autoWatch: true, // enable / disable watching files & then run tests

        browsers: ['Chrome'], //'PhantomJS', 'Firefox',

        singleRun: true, // if true, Karma captures browsers, runs the tests and exits

        concurrency: Infinity, // how many browser should be started simultaneous

        webpack: webpackConf, // Pass your webpack.config.js file's content

        webpackMiddleware: {
            noInfo: true
        },

        /**
         * base path that will be used to resolve all patterns (eg. files, exclude)
         * This should be your JS Folder where all source javascript
         * files are located.
         */
        basePath: './resources/assets/js/',

        files: ['tests/index.js'],

        // list of files to exclude
        exclude: [
        ],

        /**
         * pre-process matching files before serving them to the browser
         * Add your App entry point as well as your Tests files which should be
         * stored under the tests directory in your basePath also this expects
         * you to save your tests with a .spec.js file extension. This assumes we
         * are writing in ES6 and would run our file through babel before webpack.
         */
        preprocessors: {
            'tests/index.js': ['webpack']
        }
    })
}