test.js

var gulp = require('gulp');

module.exports = function(config) {
  var src = config.paths.test

  return function() {
    var browserify = require('gulp-browserify');
    var karma = require('gulp-karma');
    var es6ify = require('es6ify');

    return gulp.src(src)
      .pipe(browserify({
        debug: true,
        add: [ es6ify.runtime ],
        transform: ['reactify', 'es6ify']
      }))
      .pipe(karma({
        configFile: 'karma.conf.js',
        action: 'run'
      }))
      .on('error', function(err) {
        // Make sure failed tests cause gulp to exit non-zero
        throw err;
      });
  };
};