diff --git a/tests/common.py b/tests/common.py
index 24b9134c32e..149fb057a97 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -934,7 +934,7 @@ class MockConfigEntry(config_entries.ConfigEntry):
             kwargs["state"] = state
         super().__init__(**kwargs)
         if reason is not None:
-            self.reason = reason
+            object.__setattr__(self, "reason", reason)
 
     def add_to_hass(self, hass: HomeAssistant) -> None:
         """Test helper to add entry to hass."""
diff --git a/tests/components/automation/test_blueprint.py b/tests/components/automation/test_blueprint.py
index 2976886881d..5df33f9b4b8 100644
--- a/tests/components/automation/test_blueprint.py
+++ b/tests/components/automation/test_blueprint.py
@@ -47,7 +47,7 @@ async def test_notify_leaving_zone(
 ) -> None:
     """Test notifying leaving a zone blueprint."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
 
     device = device_registry.async_get_or_create(
diff --git a/tests/components/automation/test_init.py b/tests/components/automation/test_init.py
index 3a8c12f735a..e75f41ad36b 100644
--- a/tests/components/automation/test_init.py
+++ b/tests/components/automation/test_init.py
@@ -1601,7 +1601,7 @@ async def test_extraction_functions(
 ) -> None:
     """Test extraction functions."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
 
     condition_device = device_registry.async_get_or_create(
diff --git a/tests/components/device_automation/test_init.py b/tests/components/device_automation/test_init.py
index 457b7ccbf9b..9a7d54fb690 100644
--- a/tests/components/device_automation/test_init.py
+++ b/tests/components/device_automation/test_init.py
@@ -976,7 +976,7 @@ async def test_automation_with_dynamically_validated_action(
     module.async_validate_action_config = AsyncMock()
 
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_entry = device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1078,7 +1078,7 @@ async def test_automation_with_dynamically_validated_condition(
     module.async_validate_condition_config = AsyncMock()
 
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_entry = device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1192,7 +1192,7 @@ async def test_automation_with_dynamically_validated_trigger(
     module.async_validate_trigger_config = AsyncMock(wraps=lambda hass, config: config)
 
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_entry = device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1295,7 +1295,7 @@ async def test_automation_with_bad_action(
 ) -> None:
     """Test automation with bad device action."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1329,7 +1329,7 @@ async def test_automation_with_bad_condition_action(
 ) -> None:
     """Test automation with bad device action."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1362,7 +1362,7 @@ async def test_automation_with_bad_condition(
 ) -> None:
     """Test automation with bad device condition."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1527,7 +1527,7 @@ async def test_automation_with_bad_sub_condition(
 ) -> None:
     """Test automation with bad device condition under and/or conditions."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
@@ -1565,7 +1565,7 @@ async def test_automation_with_bad_trigger(
 ) -> None:
     """Test automation with bad device trigger."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
diff --git a/tests/components/powerwall/test_config_flow.py b/tests/components/powerwall/test_config_flow.py
index c10d8374bff..2f5ccf8ab80 100644
--- a/tests/components/powerwall/test_config_flow.py
+++ b/tests/components/powerwall/test_config_flow.py
@@ -497,7 +497,7 @@ async def test_dhcp_discovery_updates_unique_id_when_entry_is_failed(
         unique_id="1.2.3.4",
     )
     entry.add_to_hass(hass)
-    entry.state = config_entries.ConfigEntryState.SETUP_ERROR
+    entry.mock_state(hass, config_entries.ConfigEntryState.SETUP_ERROR)
     mock_powerwall = await _mock_powerwall_site_name(hass, "Some site")
 
     with patch(
diff --git a/tests/components/script/test_blueprint.py b/tests/components/script/test_blueprint.py
index b248a3d7650..6c9f17f29b7 100644
--- a/tests/components/script/test_blueprint.py
+++ b/tests/components/script/test_blueprint.py
@@ -47,7 +47,7 @@ async def test_confirmable_notification(
 ) -> None:
     """Test confirmable notification blueprint."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
 
     frodo = device_registry.async_get_or_create(
diff --git a/tests/components/script/test_init.py b/tests/components/script/test_init.py
index 5f8e04d527a..2d21dc924dd 100644
--- a/tests/components/script/test_init.py
+++ b/tests/components/script/test_init.py
@@ -718,7 +718,7 @@ async def test_extraction_functions(
 ) -> None:
     """Test extraction functions."""
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
 
     device_in_both = device_registry.async_get_or_create(
diff --git a/tests/components/websocket_api/test_commands.py b/tests/components/websocket_api/test_commands.py
index 9db74b9a857..88fa914f5a7 100644
--- a/tests/components/websocket_api/test_commands.py
+++ b/tests/components/websocket_api/test_commands.py
@@ -2435,7 +2435,7 @@ async def test_execute_script_with_dynamically_validated_action(
     )
 
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
     device_entry = device_registry.async_get_or_create(
         config_entry_id=config_entry.entry_id,
diff --git a/tests/components/zha/test_config_flow.py b/tests/components/zha/test_config_flow.py
index 883df4aba94..29a996d4477 100644
--- a/tests/components/zha/test_config_flow.py
+++ b/tests/components/zha/test_config_flow.py
@@ -1587,7 +1587,7 @@ async def test_options_flow_defaults(
     mock_async_unload.assert_called_once_with(entry.entry_id)
 
     # Unload it ourselves
-    entry.state = config_entries.ConfigEntryState.NOT_LOADED
+    entry.mock_state(hass, config_entries.ConfigEntryState.NOT_LOADED)
 
     # Reconfigure ZHA
     assert result1["step_id"] == "prompt_migrate_or_reconfigure"
@@ -1770,7 +1770,7 @@ async def test_options_flow_restarts_running_zha_if_cancelled(
             flow["flow_id"], user_input={}
         )
 
-    entry.state = config_entries.ConfigEntryState.NOT_LOADED
+    entry.mock_state(hass, config_entries.ConfigEntryState.NOT_LOADED)
 
     assert result1["step_id"] == "prompt_migrate_or_reconfigure"
     result2 = await hass.config_entries.options.async_configure(
@@ -1825,7 +1825,7 @@ async def test_options_flow_migration_reset_old_adapter(
             flow["flow_id"], user_input={}
         )
 
-    entry.state = config_entries.ConfigEntryState.NOT_LOADED
+    entry.mock_state(hass, config_entries.ConfigEntryState.NOT_LOADED)
 
     assert result1["step_id"] == "prompt_migrate_or_reconfigure"
     result2 = await hass.config_entries.options.async_configure(
diff --git a/tests/components/zha/test_radio_manager.py b/tests/components/zha/test_radio_manager.py
index 67f2d0164d3..5671c9cd465 100644
--- a/tests/components/zha/test_radio_manager.py
+++ b/tests/components/zha/test_radio_manager.py
@@ -224,7 +224,7 @@ async def test_migrate_matching_port_config_entry_not_loaded(
         title="Test",
     )
     config_entry.add_to_hass(hass)
-    config_entry.state = config_entries.ConfigEntryState.SETUP_IN_PROGRESS
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.SETUP_IN_PROGRESS)
 
     migration_data = {
         "new_discovery_info": {
@@ -284,7 +284,7 @@ async def test_migrate_matching_port_retry(
         title="Test",
     )
     config_entry.add_to_hass(hass)
-    config_entry.state = config_entries.ConfigEntryState.SETUP_IN_PROGRESS
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.SETUP_IN_PROGRESS)
 
     migration_data = {
         "new_discovery_info": {
@@ -389,7 +389,7 @@ async def test_migrate_initiate_failure(
         title="Test",
     )
     config_entry.add_to_hass(hass)
-    config_entry.state = config_entries.ConfigEntryState.SETUP_IN_PROGRESS
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.SETUP_IN_PROGRESS)
 
     migration_data = {
         "new_discovery_info": {
diff --git a/tests/helpers/test_script.py b/tests/helpers/test_script.py
index b2508dc7163..3dfe8fdbad9 100644
--- a/tests/helpers/test_script.py
+++ b/tests/helpers/test_script.py
@@ -4633,7 +4633,7 @@ async def test_validate_action_config(
     """Validate action config."""
 
     config_entry = MockConfigEntry(domain="fake_integration", data={})
-    config_entry.state = config_entries.ConfigEntryState.LOADED
+    config_entry.mock_state(hass, config_entries.ConfigEntryState.LOADED)
     config_entry.add_to_hass(hass)
 
     mock_device = device_registry.async_get_or_create(