Code review comment for lp:~wgrant/launchpad/bug-restrict-type

This looks like excellent work. I have one mis-giving:

373 - BranchCannotChangeInformationType,
374 - branch.setPrivate,
375 - True, branch.owner)
376 + CannotChangeInformationType,
377 + branch.setPrivate, True, branch.owner)

395 - BranchCannotChangeInformationType,
396 - branch.setPrivate,
397 - False, branch.owner)
398 + CannotChangeInformationType,
399 + branch.setPrivate, False, branch.owner)

Given you've added text to the branch cases that raise CannotChangeInformationType, can you flip these tests to making use of self.assertRaisesWithContent() and make certain the exception text is right.