Is this the best reference sample for Dagger2?

Hi, I'm trying (and failing) to understand how to use Dagger 2. I found a link to this repo and browsing the code I was surprised to see no README and the code itself to be quite confusing. I couldn't find an example of @Inject or anything to do with scopes.

I've already elsewhere that Dagger 2 has no easy override mechanism for ease of testing. Is that true?
