Allow injection test function to accept either es2015 export module and module.exports

[pragmaticivan]

Currently, the code just checks the default object inside the module:

  test(filename, module, magnet) {
    return isObject(module.route) && isFunction(module.default);
  },

Should the test function allow the user to be able to do something like that?

module.exports = function() {
}

exports route={};