old_contents: /**
   * Creates an instance of `Request`.
   *
   * This class is used as a mock when testing Express handlers, substituted in
   * place of of a Node's `http.IncomingMessage`.
   *
   * @constructor
   * @api protected
   */
  function Request() {
    this.method = 'GET';
    this.url = '/';
    this.headers = {};
  }
  
  
  /**
   * Expose `Request`.
   */
  module.exports = Request;
  
new_contents: /**
   * Creates an instance of `Request`.
   *
   * This class is used as a mock when testing Express handlers, substituted in
   * place of of a Node's `http.IncomingMessage`.
   *
   * @constructor
   * @api protected
   */
  function Request() {
    this.method = 'GET';
    this.url = '/';
    this.headers = {};
    this.params = {};
  }
  
  
  /**
   * Expose `Request`.
   */
  module.exports = Request;
  
subject: Add req.params.