I think it is a shame to waste the nice name "nexus" just for a test facility; rather I've named our central routing hub in the UI-Bus gui::ctrl::Nexus So it makes sense to name the fake for unit testing the test-nexus (we're not at nexus 5 yet)
...especially since we need a faked UI backbone for unit testing
no trailing underscore
prompted by first attempt to define the Tangible interface... ZOMG! And I thought I might be able just to code-up that stuff
