python-openstackclient/openstackclient/tests/common/test_clientmanager.py

#   Copyright 2012-2013 OpenStack, LLC.
#
#   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 openstackclient.common import clientmanager
from openstackclient.tests import utils


class Container(object):
    attr = clientmanager.ClientCache(lambda x: object())

    def __init__(self):
        pass


class TestClientManager(utils.TestCase):
    def setUp(self):
        super(TestClientManager, self).setUp()

    def test_singleton(self):
        # NOTE(dtroyer): Verify that the ClientCache descriptor only invokes
        # the factory one time and always returns the same value after that.
        c = Container()
        self.assertEqual(c.attr, c.attr)