test_expected_exceptions.py

# Copyright 2012 OpenStack Foundation
# Copyright 2013 Red Hat, Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

from oslo import messaging

from tests import utils as test_utils


class TestExpectedExceptions(test_utils.BaseTestCase):

    def test_exception(self):
        e = None
        try:
            try:
                raise ValueError()
            except Exception:
                raise messaging.ExpectedException()
        except messaging.ExpectedException as e:
            self.assertIsInstance(e, messaging.ExpectedException)
            self.assertTrue(hasattr(e, 'exc_info'))
            self.assertIsInstance(e.exc_info[1], ValueError)

    def test_decorator_expected(self):
        class FooException(Exception):
            pass

        @messaging.expected_exceptions(FooException)
        def naughty():
            raise FooException()

        self.assertRaises(messaging.ExpectedException, naughty)

    def test_decorator_unexpected(self):
        class FooException(Exception):
            pass

        @messaging.expected_exceptions(FooException)
        def really_naughty():
            raise ValueError()

        self.assertRaises(ValueError, really_naughty)