GovernorAdmin: determine whether to isolate the unit tests via mock

[wildmolasses]

hmm, let's decide whether it's appropriate for this functionality to be tested via integration (via BasicCouncilGovernor) or via mock (to isolate the unit's functionality). for now, i'm ok with this!

Originally posted by @wildmolasses in #11 (comment)

[funkyenough]

Unit test with mock alone may not be sufficient, and we definitely want to test GovernorAdmin via integration.
Therefore I am leaning towards testing it via integration only.