没有这样的文件加载 - rspec / matchers - rspec-rails，shoulda，cucumber，factory girl，Rails2.3.10

I've inherited an old Rails2.3 app. It's very complex and has (shock, horror) no tests whatsoever. I'm used to rspec and cucumber so I thought I'd start working on getting specs and features defined for the eventual (long-away) upgrade to Rails 3. It's easier to upgrade if I know exactly what will fail. I've inherited an old Rails2.3 app. It's very c