Add some tests for authService

Here's some more angular tests that can serve as examples.
Ah. The reason I did this was to separate injection of all the angular + 3rd party defined stuff, and what is our stuff. I could see some of these injections getting pretty large, but I'm ok with reverting to all the injections in a single beforeEach.

I do think it would be nice to keep all injection stuff in its own beforeEach.