✏ EDIT: karma.conf.js

// Karma configuration
// Generated on Fri Dec 16 2016 13:09:51 GMT+0000 (UTC)

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: ['mocha', 'chai', 'sinon'],

// list of files / patterns to load in the browser
    files: [
      'dist/debug.js',
      'test/*spec.js'
    ],

// list of files to exclude
    exclude: [
      'src/node.js'
    ],

// preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
    },

// test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress'],

// 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
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers: ['PhantomJS'],

// Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: false,

// Concurrency level
    // how many browser should be started simultaneous
    concurrency: Infinity
  })
}

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