new_contents: """Test deprecation helpers."""
  from homeassistant.helpers.deprecation import (
      deprecated_substitute, get_deprecated)
  
  from unittest.mock import patch, MagicMock
  
  
  class MockBaseClass():
      """Mock base class for deprecated testing."""
  
      @property
      @deprecated_substitute('old_property')
      def new_property(self):
          """Test property to fetch."""
          raise NotImplementedError()
  
  
  class MockDeprecatedClass(MockBaseClass):
      """Mock deprecated class object."""
  
      @property
      def old_property(self):
          """Test property to fetch."""
          return True
  
  
  class MockUpdatedClass(MockBaseClass):
      """Mock updated class object."""
  
      @property
      def new_property(self):
          """Test property to fetch."""
          return True
  
  
  @patch('logging.getLogger')
  def test_deprecated_substitute_old_class(mock_get_logger):
      """Test deprecated class object."""
      mock_logger = MagicMock()
      mock_get_logger.return_value = mock_logger
  
      mock_object = MockDeprecatedClass()
      assert mock_object.new_property is True
      assert mock_object.new_property is True
      assert mock_logger.warning.called
      assert len(mock_logger.warning.mock_calls) == 1
  
  
  @patch('logging.getLogger')
  def test_deprecated_substitute_new_class(mock_get_logger):
      """Test deprecated class object."""
      mock_logger = MagicMock()
      mock_get_logger.return_value = mock_logger
  
      mock_object = MockUpdatedClass()
      assert mock_object.new_property is True
      assert mock_object.new_property is True
      assert not mock_logger.warning.called
  
  
  @patch('logging.getLogger')
  def test_config_get_deprecated_old(mock_get_logger):
      """Test deprecated class object."""
      mock_logger = MagicMock()
      mock_get_logger.return_value = mock_logger
  
      config = {
          'old_name': True,
      }
      assert get_deprecated(config, 'new_name', 'old_name') is True
      assert mock_logger.warning.called
      assert len(mock_logger.warning.mock_calls) == 1
  
  
  @patch('logging.getLogger')
  def test_config_get_deprecated_new(mock_get_logger):
      """Test deprecated class object."""
      mock_logger = MagicMock()
      mock_get_logger.return_value = mock_logger
  
      config = {
          'new_name': True,
      }
      assert get_deprecated(config, 'new_name', 'old_name') is True
      assert not mock_logger.warning.called
  
subject: Add tests for deprecation helpers (#7452)