test-main.js

var allTestFiles = [];
var TEST_REGEXP = /(spec|test)\.js$/i;

var pathToModule = function(path) {
  return path.replace(/^\/base\//, '').replace(/\.js$/, '');
};

Object.keys(window.__karma__.files).forEach(function(file) {
  if (TEST_REGEXP.test(file)) {
    // Normalize paths to RequireJS module names.
    allTestFiles.push(pathToModule(file));
  }
});

require.config({
  // Karma serves files under /base, which is the basePath from your config file
  baseUrl: '/base',
  paths: {
    'underscore': 'bower_components/underscore/underscore',
    'jquery': 'bower_components/jquery/dist/jquery',
    'engine': 'engine'
  },
  shim: {
    'underscore': {
      exports: '_'
    }
  },
  // dynamically load all test files
  deps: allTestFiles,

  // we have to kickoff jasmine, as it is asynchronous
  callback: window.__karma__.start
});