old_contents: # -*- coding: utf-8 -*-
  
  # 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.
  
  """
  test_callback_exceptions
  ----------------------------------
  
  Tests for `neutron_lib.callback.exceptions` module.
  """
  
  import functools
  
  import neutron_lib._callbacks.exceptions as ex
  from neutron_lib.tests.unit import test_exceptions
  
  
  class TestCallbackExceptions(test_exceptions.TestExceptions):
  
      def _check_exception(self, exc_class, expected_msg, **kwargs):
          raise_exc_class = functools.partial(test_exceptions._raise, exc_class)
          e = self.assertRaises(exc_class, raise_exc_class, **kwargs)
          self.assertEqual(expected_msg, str(e))
  
      def test_invalid(self):
          self._check_exception(
              ex.Invalid,
              "The value 'foo' for bar is not valid.",
              value='foo', element='bar')
  
      def test_callback_failure(self):
          self._check_exception(
              ex.CallbackFailure,
              'one',
              errors='one')
  
      def test_callback_failure_with_list(self):
          self._check_exception(
              ex.CallbackFailure,
              '1,2,3',
              errors=[1, 2, 3])
  
      def test_notification_error(self):
          '''Test that correct message is create for this error class.'''
          error = ex.NotificationError('abc', 'boom')
          self.assertEqual('Callback abc failed with "boom"', str(error))
  
new_contents: # -*- coding: utf-8 -*-
  
  # 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.
  
  """
  test_callback_exceptions
  ----------------------------------
  
  Tests for `neutron_lib.callback.exceptions` module.
  """
  
  import functools
  
  import neutron_lib._callbacks.exceptions as ex
  from neutron_lib.tests.unit import test_exceptions
  
  
  class TestCallbackExceptions(test_exceptions.TestExceptions):
  
      def _check_exception(self, exc_class, expected_msg, **kwargs):
          raise_exc_class = functools.partial(test_exceptions._raise, exc_class)
          e = self.assertRaises(exc_class, raise_exc_class, **kwargs)
          self.assertEqual(expected_msg, str(e))
  
      def test_invalid(self):
          self._check_exception(
              ex.Invalid,
              "The value 'foo' for bar is not valid.",
              value='foo', element='bar')
  
      def test_callback_failure(self):
          self._check_exception(
              ex.CallbackFailure,
              'one',
              errors='one')
  
      def test_callback_failure_with_list(self):
          self._check_exception(
              ex.CallbackFailure,
              '1,2,3',
              errors=[1, 2, 3])
  
      def test_notification_error(self):
          '''Test that correct message is created for this error class.'''
          error = ex.NotificationError('abc', 'boom')
          self.assertEqual('Callback abc failed with "boom"', str(error))
  
subject: Fix simple typo