'Try creating a group with the same name as an existing user and
assert that it succeeds, since users and groups should not be in the
same namespace and collisions should be impossible.'

def testGroupUsernameCollision(self):

    realm = service.InMemoryWordsRealm('realmname')
    self.successResultOf(realm.createUser(u'test'))
    self.successResultOf(realm.createGroup(u'test'))
