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# Copyright 2010-2011 OpenStack Foundation
# All Rights Reserved.
#
#    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.

import contextlib

from oslo.config import cfg
from oslotest import base as test_base
from oslotest import moxstubout
import six


if six.PY3:
    @contextlib.contextmanager
    def nested(*contexts):
        with contextlib.ExitStack() as stack:
            yield [stack.enter_context(c) for c in contexts]
else:
    nested = contextlib.nested


class BaseTestCase(test_base.BaseTestCase):
    def setUp(self, conf=cfg.CONF):
        super(BaseTestCase, self).setUp()
        moxfixture = self.useFixture(moxstubout.MoxStubout())
        self.mox = moxfixture.mox
        self.stubs = moxfixture.stubs
        self.conf = conf
        self.addCleanup(self.conf.reset)