Snippet of a Karma configuration using karma-systemjs

karma-systemjs.conf.js

// Add 'karma-systemjs' to the list of plugins
plugins: ['karma-systemjs', ...],

// Add 'systemjs' to the list of frameworks
frameworks: ['systemjs', 'jasmine'],

// Move all the `files` to `systemjs.files`
files: [],

systemjs: {
  files: [
    'app/bower_components/angular/angular.js',
    'app/bower_components/angular-route/angular-route.js',
    'app/bower_components/angular-mocks/angular-mocks.js',
    'app/*/**/*.js'
  ],

  // Point out where the SystemJS config file is
  configFile: 'app/system.config.js',

  // Add any additional configuration, such as mappings to modules only used in testing
  config: {
    paths: {
      'angular-mocks': 'bower_components/angular-mocks/angular-mocks.js'
    }
  }
}