Bartosz Szewczyk

Either use [babel-proprocessor](https://github.com/babel/karma-babel-preprocessor) or [traceur-preprocessor](https://github.com/karma-runner/karma-traceur-preprocessor) to transpile (preprocess) test files and it should work.

Yes but you can preprocess files which are passed to jspm loadFiles section.

``` javascript module.exports = function(config) { config.set({ basePath: process.cwd(), frameworks: ['jspm', 'jasmine', 'source-map-support'], files: [], exclude: [], preprocessors: { 'src/**/*.js': ['babel'], 'tests/**/*.spec.js': ['babel'] }, babelPreprocessor: { options: { sourceMap: 'inline',...