I know there are lots of tools for split testing (a/b testing). They generally rely on creating multiple versions of a page which are shown to random visitors, and they track what percentage of each variation leads the user to a conversion page (or to click on an event-tracked button).
I'm interested in a bit different problem. I'd like to split test the name I display for one of my top level menu items - variations might be "Shop", "Things I Love", "Recommendations", etc. That menu item is on every page, so there is no reasonable way to split test it by creating whole new copies of pages.
Clearly I could write some custom code to do this, but it seems like a common enough need that there should be a plugin for it. Or if not, has anyone got any code they would like to share?