text: # -*- coding: utf-8 -*-
  
  # Copyright 2010-2011 OpenStack Foundation
  # Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
  #
  # 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 os
  
  import fixtures
  import testtools
  
  _TRUE_VALUES = ('True', 'true', '1', 'yes')
  
  
  class TestCase(testtools.TestCase):
  
      """Test case base class for all unit tests."""
  
      def setUp(self):
          """Run before each test method to initialize test environment."""
  
          super(TestCase, self).setUp()
          test_timeout = os.environ.get('OS_TEST_TIMEOUT', 0)
          try:
              test_timeout = int(test_timeout)
          except ValueError:
              # If timeout value is invalid do not set a timeout.
              test_timeout = 0
          if test_timeout > 0:
              self.useFixture(fixtures.Timeout(test_timeout, gentle=True))
  
          self.useFixture(fixtures.NestedTempfile())
          self.useFixture(fixtures.TempHomeDir())
  
          if os.environ.get('OS_STDOUT_CAPTURE') in _TRUE_VALUES:
              stdout = self.useFixture(fixtures.StringStream('stdout')).stream
              self.useFixture(fixtures.MonkeyPatch('sys.stdout', stdout))
          if os.environ.get('OS_STDERR_CAPTURE') in _TRUE_VALUES:
              stderr = self.useFixture(fixtures.StringStream('stderr')).stream
              self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))
  
          self.log_fixture = self.useFixture(fixtures.FakeLogger())