Reworked based upon feedback and my own use.
Changes:
* I changed how this switches between calling methods of a model or running unit tests. This makes it a lot easier to navigate.
* I hid the model switching controls until you need it. The main navigation is updated too. This reduces clutter on screen.
* Minor bug fixes.
* Reworked some of the code to be more template-like, yet still fit into one file.
Any users yet? I'd love to see comments on function, not just code reviews (of an obviously rapidly hacked project!).

Not trying to dis code comments; they're still welcome.