diff --git a/tests/auth/providers/test_legacy_api_password.py b/tests/auth/providers/test_legacy_api_password.py
index c8d32fbc59a..a9ef03fd27b 100644
--- a/tests/auth/providers/test_legacy_api_password.py
+++ b/tests/auth/providers/test_legacy_api_password.py
@@ -79,7 +79,7 @@ async def test_login_flow_works(hass: HomeAssistant, manager) -> None:
 
 async def test_create_repair_issue(
     hass: HomeAssistant, issue_registry: ir.IssueRegistry
-):
+) -> None:
     """Test legacy api password auth provider creates a reapir issue."""
     hass.auth = await auth.auth_manager_from_config(hass, [CONFIG], [])
     ensure_auth_manager_loaded(hass.auth)
diff --git a/tests/common.py b/tests/common.py
index 24fb6cf458f..114e683fbfa 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -901,7 +901,7 @@ class MockEntityPlatform(entity_platform.EntityPlatform):
         platform=None,
         scan_interval=timedelta(seconds=15),
         entity_namespace=None,
-    ):
+    ) -> None:
         """Initialize a mock entity platform."""
         if logger is None:
             logger = logging.getLogger("homeassistant.helpers.entity_platform")
diff --git a/tests/components/bluetooth/test_wrappers.py b/tests/components/bluetooth/test_wrappers.py
index 9c537079db7..0c5645b3f71 100644
--- a/tests/components/bluetooth/test_wrappers.py
+++ b/tests/components/bluetooth/test_wrappers.py
@@ -72,7 +72,7 @@ class FakeScanner(BaseHaRemoteScanner):
 class BaseFakeBleakClient:
     """Base class for fake bleak clients."""
 
-    def __init__(self, address_or_ble_device: BLEDevice | str, **kwargs):
+    def __init__(self, address_or_ble_device: BLEDevice | str, **kwargs) -> None:
         """Initialize the fake bleak client."""
         self._device_path = "/dev/test"
         self._device = address_or_ble_device
diff --git a/tests/components/enigma2/test_config_flow.py b/tests/components/enigma2/test_config_flow.py
index a1074ed9e34..74721ce0993 100644
--- a/tests/components/enigma2/test_config_flow.py
+++ b/tests/components/enigma2/test_config_flow.py
@@ -168,7 +168,7 @@ async def test_form_import_errors(
     assert result["reason"] == error_type
 
 
-async def test_options_flow(hass: HomeAssistant, user_flow: str):
+async def test_options_flow(hass: HomeAssistant, user_flow: str) -> None:
     """Test the form options."""
 
     with patch(
diff --git a/tests/components/homematicip_cloud/helper.py b/tests/components/homematicip_cloud/helper.py
index f82880d3fa8..e7d7350f98e 100644
--- a/tests/components/homematicip_cloud/helper.py
+++ b/tests/components/homematicip_cloud/helper.py
@@ -77,7 +77,7 @@ class HomeFactory:
         hass: HomeAssistant,
         mock_connection,
         hmip_config_entry: config_entries.ConfigEntry,
-    ):
+    ) -> None:
         """Initialize the Factory."""
         self.hass = hass
         self.mock_connection = mock_connection
diff --git a/tests/components/knx/conftest.py b/tests/components/knx/conftest.py
index 5cdeb0d8adb..cd7146b565b 100644
--- a/tests/components/knx/conftest.py
+++ b/tests/components/knx/conftest.py
@@ -44,7 +44,7 @@ class KNXTestKit:
 
     INDIVIDUAL_ADDRESS = "1.2.3"
 
-    def __init__(self, hass: HomeAssistant, mock_config_entry: MockConfigEntry):
+    def __init__(self, hass: HomeAssistant, mock_config_entry: MockConfigEntry) -> None:
         """Init KNX test helper class."""
         self.hass: HomeAssistant = hass
         self.mock_config_entry: MockConfigEntry = mock_config_entry
diff --git a/tests/components/light/common.py b/tests/components/light/common.py
index fd9557b05b2..7c33c40ab63 100644
--- a/tests/components/light/common.py
+++ b/tests/components/light/common.py
@@ -254,7 +254,7 @@ class MockLight(MockToggleEntity, LightEntity):
         state,
         unique_id=None,
         supported_color_modes: set[ColorMode] | None = None,
-    ):
+    ) -> None:
         """Initialize the mock light."""
         super().__init__(name, state, unique_id)
         if supported_color_modes is None:
diff --git a/tests/components/logbook/common.py b/tests/components/logbook/common.py
index 67b83a19768..67f12955581 100644
--- a/tests/components/logbook/common.py
+++ b/tests/components/logbook/common.py
@@ -27,7 +27,7 @@ class MockRow:
         event_type: str,
         data: dict[str, Any] | None = None,
         context: Context | None = None,
-    ):
+    ) -> None:
         """Init the fake row."""
         self.event_type = event_type
         self.event_data = json.dumps(data, cls=JSONEncoder)
diff --git a/tests/components/reddit/test_sensor.py b/tests/components/reddit/test_sensor.py
index 92ee282e9c8..52dac07d621 100644
--- a/tests/components/reddit/test_sensor.py
+++ b/tests/components/reddit/test_sensor.py
@@ -111,7 +111,7 @@ class MockPraw:
         username: str,
         password: str,
         user_agent: str,
-    ):
+    ) -> None:
         """Add mock data for API return."""
         self._data = MOCK_RESULTS
 
@@ -123,7 +123,7 @@ class MockPraw:
 class MockSubreddit:
     """Mock class for a subreddit instance."""
 
-    def __init__(self, subreddit: str, data):
+    def __init__(self, subreddit: str, data) -> None:
         """Add mock data for API return."""
         self._subreddit = subreddit
         self._data = data
diff --git a/tests/components/sonos/conftest.py b/tests/components/sonos/conftest.py
index 478443fff76..c7f5cfb7223 100644
--- a/tests/components/sonos/conftest.py
+++ b/tests/components/sonos/conftest.py
@@ -323,7 +323,7 @@ class MockMusicServiceItem:
         parent_id: str,
         item_class: str,
         album_art_uri: None | str = None,
-    ):
+    ) -> None:
         """Initialize the mock item."""
         self.title = title
         self.item_id = item_id
diff --git a/tests/components/youtube/__init__.py b/tests/components/youtube/__init__.py
index 8f6da97481a..1b559f0f1c4 100644
--- a/tests/components/youtube/__init__.py
+++ b/tests/components/youtube/__init__.py
@@ -19,7 +19,7 @@ class MockYouTube:
         channel_fixture: str = "youtube/get_channel.json",
         playlist_items_fixture: str = "youtube/get_playlist_items.json",
         subscriptions_fixture: str = "youtube/get_subscriptions.json",
-    ):
+    ) -> None:
         """Initialize mock service."""
         self._channel_fixture = channel_fixture
         self._playlist_items_fixture = playlist_items_fixture
diff --git a/tests/helpers/test_entity.py b/tests/helpers/test_entity.py
index a8524d73a5d..cc53bca8e4d 100644
--- a/tests/helpers/test_entity.py
+++ b/tests/helpers/test_entity.py
@@ -1873,7 +1873,7 @@ async def test_change_entity_id(
     assert len(ent.remove_calls) == 2
 
 
-def test_entity_description_as_dataclass(snapshot: SnapshotAssertion):
+def test_entity_description_as_dataclass(snapshot: SnapshotAssertion) -> None:
     """Test EntityDescription behaves like a dataclass."""
 
     obj = entity.EntityDescription("blah", device_class="test")
@@ -1888,7 +1888,7 @@ def test_entity_description_as_dataclass(snapshot: SnapshotAssertion):
     assert repr(obj) == snapshot
 
 
-def test_extending_entity_description(snapshot: SnapshotAssertion):
+def test_extending_entity_description(snapshot: SnapshotAssertion) -> None:
     """Test extending entity descriptions."""
 
     @dataclasses.dataclass(frozen=True)
diff --git a/tests/helpers/test_template.py b/tests/helpers/test_template.py
index 6b75ff384b6..0547ddf8823 100644
--- a/tests/helpers/test_template.py
+++ b/tests/helpers/test_template.py
@@ -2067,7 +2067,7 @@ def test_states_function(hass: HomeAssistant) -> None:
 
 async def test_state_translated(
     hass: HomeAssistant, entity_registry: er.EntityRegistry
-):
+) -> None:
     """Test state_translated method."""
     assert await async_setup_component(
         hass,
diff --git a/tests/helpers/test_translation.py b/tests/helpers/test_translation.py
index dfe96562a4a..da81016e153 100644
--- a/tests/helpers/test_translation.py
+++ b/tests/helpers/test_translation.py
@@ -549,7 +549,7 @@ async def test_get_cached_translations(
     }
 
 
-async def test_setup(hass: HomeAssistant):
+async def test_setup(hass: HomeAssistant) -> None:
     """Test the setup load listeners helper."""
     translation.async_setup(hass)
 
@@ -577,7 +577,7 @@ async def test_setup(hass: HomeAssistant):
         mock.assert_not_called()
 
 
-async def test_translate_state(hass: HomeAssistant):
+async def test_translate_state(hass: HomeAssistant) -> None:
     """Test the state translation helper."""
     result = translation.async_translate_state(
         hass, "unavailable", "binary_sensor", "platform", "translation_key", None
diff --git a/tests/helpers/test_trigger.py b/tests/helpers/test_trigger.py
index e8322c7e660..0bd5da0707c 100644
--- a/tests/helpers/test_trigger.py
+++ b/tests/helpers/test_trigger.py
@@ -287,7 +287,9 @@ async def test_async_initialize_triggers(
         unsub()
 
 
-async def test_pluggable_action(hass: HomeAssistant, service_calls: list[ServiceCall]):
+async def test_pluggable_action(
+    hass: HomeAssistant, service_calls: list[ServiceCall]
+) -> None:
     """Test normal behavior of pluggable actions."""
     update_1 = MagicMock()
     update_2 = MagicMock()