Code review comment for lp://staging/~abentley/launchpad/bmp-iprivacy

> 115 +class TestBranchMergeProposalPrivacy(TestCaseWithFactory):
> 116 + """Ensure that BranchMergeProposal implements its interface."""

I think you need to change this to say "... implements IPrivacy" or something like that. Otherwise, nice branch.