Karma rake task

karma.coffee.erb

# Karma configuration
# Generated on Tue Aug 20 2013 16:26:25 GMT-0400 (EDT)

module.exports = (config) ->
  config.set

    # base path, that will be used to resolve all patterns, eg. files, exclude
    basePath: '..'

    # frameworks to use
    frameworks: ['jasmine']

    # list of files / patterns to load in the browser
    files: [
      'http://ajax.googleapis.com/ajax/libs/angularjs/1.2.1/angular.js'
      'http://code.angularjs.org/1.2.1/angular-mocks.js'
      'http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.js'

      'http://localhost:<%= @port %>/assets/spec.js'

    ]

    # list of files to exclude
    exclude: [

    ]

    # 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
    # - Safari (only Mac)
    # - PhantomJS
    # - IE (only Windows)
    browsers: ['PhantomJS']

    # If browser does not capture in given timeout [ms], kill it
    captureTimeout: 10000

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

karma.rake

require 'open3'

namespace :test do

  desc 'Run all javascript tests with Karma'
  task :karma => :environment do
    # Use capybara to boot up a rails server for us,
    # and configure sprockets to serve javascripts from the spec directory

    Rails.application.assets.append_path Rails.root.join('spec', 'javascripts')
    server = Capybara::Server.new(Rails.application).boot
    puts "Booted Rails test server on port #{server.port}"

    Dir.mktmpdir do |dir|

      # Generate a temp karma configuration file from our template in config/karma.coffee.erb.
      # We're just doing this to stick the server port in, but could add a dynamic list of files too:
      view = ActionView::Base.new(Rails.root.join('config'))
      view.assign(port: server.port)

      karma_conf = File.join(dir, "karma.coffee")
      File.open(karma_conf, 'w') { |file| file.write view.render(template: 'karma.coffee.erb') }

      puts "Running karma with configuration file #{karma_conf}"
      Open3.popen2e("karma start #{karma_conf} --single-run") do |stdin, stdout_and_stderr, wait_thr|
        puts stdout_and_stderr.gets(nil)
        raise 'Karma tests failed' unless wait_thr.value.success?
      end

    end
  end

end

Helped me a lot, thanks!

Awesome +1