application.css and application.js are automatically included as top level assets in Rails apps.

[stephenprater]

Within the source directory are Sprockets-style application.js, application.css files. If you install the jquery-sortable library into a directory on the sprockets load path (IE, via rails-bower) those files are automatically compiled as top level assets, which doesn't seem right to me.

I think the easiest way to fix this would be to ensure that the Sprockets / Test files are not-included in a bower install - but I'm not sure if this problem is going to occur in other environments.

That said, as far as I can tell, those files are used only for testing and won't work in any NON-Rails environment, so they should probably included in the ignore list in any case.