new_contents: # Copyright 2010 United States Government as represented by the
  # Administrator of the National Aeronautics and Space Administration.
  # 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 fixtures as fx
  from oslo_log import log as logging
  import testtools
  
  from cinder.tests import fixtures
  
  
  class TestLogging(testtools.TestCase):
      def test_default_logging(self):
          stdlog = self.useFixture(fixtures.StandardLogging())
          root = logging.getLogger()
          # there should be a null handler as well at DEBUG
          self.assertEqual(2, len(root.handlers), root.handlers)
          log = logging.getLogger(__name__)
          log.info("at info")
          log.debug("at debug")
          self.assertIn("at info", stdlog.logger.output)
          self.assertNotIn("at debug", stdlog.logger.output)
  
          # broken debug messages should still explode, even though we
          # aren't logging them in the regular handler
          self.assertRaises(TypeError, log.debug, "this is broken %s %s", "foo")
  
          # and, ensure that one of the terrible log messages isn't
          # output at info
          warn_log = logging.getLogger('migrate.versioning.api')
          warn_log.info("warn_log at info, should be skipped")
          warn_log.error("warn_log at error")
          self.assertIn("warn_log at error", stdlog.logger.output)
          self.assertNotIn("warn_log at info", stdlog.logger.output)
  
      def test_debug_logging(self):
          self.useFixture(fx.EnvironmentVariable('OS_DEBUG', '1'))
  
          stdlog = self.useFixture(fixtures.StandardLogging())
          root = logging.getLogger()
          # there should no longer be a null handler
          self.assertEqual(1, len(root.handlers), root.handlers)
          log = logging.getLogger(__name__)
          log.info("at info")
          log.debug("at debug")
          self.assertIn("at info", stdlog.logger.output)
          self.assertIn("at debug", stdlog.logger.output)
  
subject: Copy unit tests for StandardLogging fixture from Nova