Navigation Extension Tests

I might be missing something, but when the navigation extensions write out a link for a non-default action of the current controller, the URL isn't correct. 

For example, the Url for the Index action of Home is ok ("/"), but for About the link comes out as /about instead of /home/about. 

I added a failing test to the project, if this helps.

If I am misunderstanding how to use the navigation extensions, please disregard :)