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  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You 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 sys
  
  from mock import Mock
  
  from libcloud.common.base import BaseDriver
  
  from libcloud.test import unittest
  
  
  class BaseDriverTestCase(unittest.TestCase):
      def test_timeout_argument_propagation_and_preservation(self):
          class DummyDriver1(BaseDriver):
              pass
  
          # 1. No timeout provided
          DummyDriver1.connectionCls = Mock()
          DummyDriver1(key='foo')
          call_kwargs = DummyDriver1.connectionCls.call_args[1]
          self.assertEqual(call_kwargs['timeout'], None)
  
          # 2. Timeout provided as constructor argument
          class DummyDriver1(BaseDriver):
              pass
  
          DummyDriver1.connectionCls = Mock()
          DummyDriver1(key='foo', timeout=12)
          call_kwargs = DummyDriver1.connectionCls.call_args[1]
          self.assertEqual(call_kwargs['timeout'], 12)
  
          # 3. timeout provided via "_ex_connection_class_kwargs" method
          class DummyDriver2(BaseDriver):
              def _ex_connection_class_kwargs(self):
                  result = {}
                  result['timeout'] = 13
                  return result
  
          DummyDriver2.connectionCls = Mock()
          DummyDriver1(key='foo')
          call_kwargs = DummyDriver1.connectionCls.call_args[1]
          self.assertEqual(call_kwargs['timeout'], 13)
  
  
  if __name__ == '__main__':
      sys.exit(unittest.main())
  
subject: Add failing regression test case for timeout argument preservation on the BaseDriver class.