'Verify that the staff user can masquerade as being in all groups
as well as no group.'

def _verify_masquerade_for_all_groups(self):

    self._verify_masquerade_for_group(self.user_partition.groups[0])
    self._verify_masquerade_for_group(self.user_partition.groups[1])
    self._verify_masquerade_for_group(None)
