使用来自另一个出售宝石中的一个出售宝石的Minitest扩展时的LoadError

I have a problem with two vendored gems of a Rails 3.2 app. One gem is a Minitest extension, the other a piece of code which should use the Minitest extension in it's test suite. Since both are under development, both are vendored and not yet pushed to Rubygems.I have a problem with two vendored gems of a Ra