Example of unit.js file for karma in rails applications. This should allow tests to be written in both coffescript or javascript

unit.js

/** 
 * Karma configuration
 * 
 * Enables tests to be written in both javascript and coffeescript.
 * 
 * Run your tests with: `karma start spec/karma/config/unit.js`
 * 
 * Place your tests in similar paths: `spec/javascripts/<anydir>/<file>_spec.coffee`
 * This file should be in: `spec/karma/config/unit.js`
 * 
 * TODO:
 *   - For now "localhost:3000" is static in the file. This will prevent other developers to use pow or other ports.
 *   - While using rails server to host an compiled "application.js" file we wont get valid backtraces.
 */
module.exports = function(config) {
  config.set({

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


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

    preprocessors: {
      'spec/javascripts/**/*.coffee': ['coffee']
    },

    coffeePreprocessors: {
      options: {
        bare: true,
        sourceMap: false
      },

      transformPath: function(path) {
        return path.replace(/\.js$/, 'coffee');
      }
    },


    // list of files / patterns to load in the browser
    files: [
      'http://localhost:3000/assets/application.js',
      'spec/javascripts/*_spec.js',
      'spec/javascripts/*_spec.coffee',
      // Watch for changes in assets without serving them.
      { pattern: 'app/assets/javascripts/**/*.js',
        watched: true,
        included: false,
        served: false }
    ],


    // list of files to exclude
    exclude: [
      '**/*.swp'
    ],


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


    // 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
  });
};