text: #    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 imp
  import os
  import warnings
  
  import mock
  from oslotest import base as test_base
  import six
  
  
  class DeprecationWarningTest(test_base.BaseTestCase):
  
      @mock.patch('warnings.warn')
      def test_warning(self, mock_warn):
          import oslo.config
          imp.reload(oslo.config)
          self.assertTrue(mock_warn.called)
          args = mock_warn.call_args
          self.assertIn('oslo_config', args[0][0])
          self.assertIn('deprecated', args[0][0])
          self.assertTrue(issubclass(args[0][1], DeprecationWarning))
  
      def test_real_warning(self):
          with warnings.catch_warnings(record=True) as warning_msgs:
              warnings.resetwarnings()
              warnings.simplefilter('always', DeprecationWarning)
              import oslo.config
  
              # Use a separate function to get the stack level correct
              # so we know the message points back to this file. This
              # corresponds to an import or reload, which isn't working
              # inside the test under Python 3.3. That may be due to a
              # difference in the import implementation not triggering
              # warnings properly when the module is reloaded, or
              # because the warnings module is mostly implemented in C
              # and something isn't cleanly resetting the global state
              # used to track whether a warning needs to be
              # emitted. Whatever the cause, we definitely see the
              # warnings.warn() being invoked on a reload (see the test
              # above) and warnings are reported on the console when we
              # run the tests. A simpler test script run outside of
              # testr does correctly report the warnings.
              def foo():
                  oslo.config.deprecated()
  
              foo()
              self.assertEqual(1, len(warning_msgs))
              msg = warning_msgs[0]
              self.assertIn('oslo_config', six.text_type(msg.message))
              self.assertEqual('test_warning.py', os.path.basename(msg.filename))
  