def test_requestAvatarIdInvalidSignature(self):
        def _checkKey(ignored):
            return True
        self.patch(self.checker, 'checkKey', _checkKey)
        credentials = SSHPrivateKey(
            'test', 'ssh-rsa', keydata.publicRSA_openssh, 'foo',
            keys.Key.fromString(keydata.privateDSA_openssh).sign('foo'))
        d = self.checker.requestAvatarId(credentials)
        return self.assertFailure(d, UnauthorizedLogin)
Test nested op within nested op.
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/conch/test/test_checkers.py/SSHPublicKeyDatabaseTestCase.test_requestAvatarIdInvalidSignature--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/test/op_manager_test.py/OpManagerTestCase.testMultiNestedOp