Test this end-to-end

I'd like some way to verify the approved/working flows we support here. Because we only support inline hbs component hot reloading at the moment this might look something like ...
1. open app/ navigate to some route
2. assert the state of the component
3. modify some component.js file
4. hot reload fires
5. re-render occurs and the component is updated
6. assert the state was updated correctly

The same suite should run against:

* Dummy app
* A normal app
* An addon