diff --git a/tests/helpers/test_deprecation.py b/tests/helpers/test_deprecation.py
index 1128f7d43c6..9a24cda74dd 100644
--- a/tests/helpers/test_deprecation.py
+++ b/tests/helpers/test_deprecation.py
@@ -4,68 +4,82 @@ from unittest.mock import MagicMock, Mock, patch
 import pytest
 
 from homeassistant.helpers.deprecation import (
+    deprecated_class,
     deprecated_function,
     deprecated_substitute,
     get_deprecated,
 )
 
 
-class MockBaseClass:
+class MockBaseClassDeprecatedProperty:
     """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
+        return "default_new"
 
 
 @patch("logging.getLogger")
 def test_deprecated_substitute_old_class(mock_get_logger) -> None:
     """Test deprecated class object."""
+
+    class MockDeprecatedClass(MockBaseClassDeprecatedProperty):
+        """Mock deprecated class object."""
+
+        @property
+        def old_property(self):
+            """Test property to fetch."""
+            return "old"
+
     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_object.new_property == "old"
     assert mock_logger.warning.called
     assert len(mock_logger.warning.mock_calls) == 1
 
 
+@patch("logging.getLogger")
+def test_deprecated_substitute_default_class(mock_get_logger) -> None:
+    """Test deprecated class object."""
+
+    class MockDefaultClass(MockBaseClassDeprecatedProperty):
+        """Mock updated class object."""
+
+    mock_logger = MagicMock()
+    mock_get_logger.return_value = mock_logger
+
+    mock_object = MockDefaultClass()
+    assert mock_object.new_property == "default_new"
+    assert not mock_logger.warning.called
+
+
 @patch("logging.getLogger")
 def test_deprecated_substitute_new_class(mock_get_logger) -> None:
     """Test deprecated class object."""
+
+    class MockUpdatedClass(MockBaseClassDeprecatedProperty):
+        """Mock updated class object."""
+
+        @property
+        def new_property(self):
+            """Test property to fetch."""
+            return "new"
+
     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 mock_object.new_property == "new"
     assert not mock_logger.warning.called
 
 
 @patch("logging.getLogger")
 def test_config_get_deprecated_old(mock_get_logger) -> None:
-    """Test deprecated class object."""
+    """Test deprecated config."""
     mock_logger = MagicMock()
     mock_get_logger.return_value = mock_logger
 
@@ -77,7 +91,7 @@ def test_config_get_deprecated_old(mock_get_logger) -> None:
 
 @patch("logging.getLogger")
 def test_config_get_deprecated_new(mock_get_logger) -> None:
-    """Test deprecated class object."""
+    """Test deprecated config."""
     mock_logger = MagicMock()
     mock_get_logger.return_value = mock_logger
 
@@ -86,6 +100,22 @@ def test_config_get_deprecated_new(mock_get_logger) -> None:
     assert not mock_logger.warning.called
 
 
+@deprecated_class("homeassistant.blah.NewClass")
+class MockDeprecatedClass:
+    """Mock class for deprecated testing."""
+
+
+@patch("logging.getLogger")
+def test_deprecated_class(mock_get_logger) -> None:
+    """Test deprecated class."""
+    mock_logger = MagicMock()
+    mock_get_logger.return_value = mock_logger
+
+    MockDeprecatedClass()
+    assert mock_logger.warning.called
+    assert len(mock_logger.warning.mock_calls) == 1
+
+
 def test_deprecated_function(caplog: pytest.LogCaptureFixture) -> None:
     """Test deprecated_function decorator.