diff --git a/homeassistant/components/toon/__init__.py b/homeassistant/components/toon/__init__.py
index 19466ba49c4..348826a1264 100644
--- a/homeassistant/components/toon/__init__.py
+++ b/homeassistant/components/toon/__init__.py
@@ -1,17 +1,18 @@
 """Support for Toon van Eneco devices."""
+from functools import partial
 import logging
 from typing import Any, Dict
-from functools import partial
 
+from toonapilib import Toon
 import voluptuous as vol
 
+from homeassistant.const import CONF_PASSWORD, CONF_SCAN_INTERVAL, CONF_USERNAME
 from homeassistant.core import callback
-from homeassistant.const import CONF_PASSWORD, CONF_USERNAME, CONF_SCAN_INTERVAL
 from homeassistant.helpers import config_validation as cv, device_registry as dr
+from homeassistant.helpers.dispatcher import async_dispatcher_connect, dispatcher_send
 from homeassistant.helpers.entity import Entity
-from homeassistant.helpers.typing import ConfigType, HomeAssistantType
 from homeassistant.helpers.event import async_track_time_interval
-from homeassistant.helpers.dispatcher import dispatcher_send, async_dispatcher_connect
+from homeassistant.helpers.typing import ConfigType, HomeAssistantType
 
 from . import config_flow  # noqa: F401
 from .const import (
@@ -19,10 +20,10 @@ from .const import (
     CONF_CLIENT_SECRET,
     CONF_DISPLAY,
     CONF_TENANT,
+    DATA_TOON,
     DATA_TOON_CLIENT,
     DATA_TOON_CONFIG,
     DATA_TOON_UPDATED,
-    DATA_TOON,
     DEFAULT_SCAN_INTERVAL,
     DOMAIN,
 )
@@ -63,7 +64,6 @@ async def async_setup(hass: HomeAssistantType, config: ConfigType) -> bool:
 
 async def async_setup_entry(hass: HomeAssistantType, entry: ConfigType) -> bool:
     """Set up Toon from a config entry."""
-    from toonapilib import Toon
 
     conf = hass.data.get(DATA_TOON_CONFIG)
 
diff --git a/homeassistant/components/toon/binary_sensor.py b/homeassistant/components/toon/binary_sensor.py
index 9962e2c32d3..7cf52919efe 100644
--- a/homeassistant/components/toon/binary_sensor.py
+++ b/homeassistant/components/toon/binary_sensor.py
@@ -8,11 +8,11 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.helpers.typing import HomeAssistantType
 
 from . import (
-    ToonData,
-    ToonEntity,
-    ToonDisplayDeviceEntity,
     ToonBoilerDeviceEntity,
     ToonBoilerModuleDeviceEntity,
+    ToonData,
+    ToonDisplayDeviceEntity,
+    ToonEntity,
 )
 from .const import DATA_TOON, DOMAIN
 
diff --git a/homeassistant/components/toon/climate.py b/homeassistant/components/toon/climate.py
index cfe07adfda3..9ce9991c371 100644
--- a/homeassistant/components/toon/climate.py
+++ b/homeassistant/components/toon/climate.py
@@ -5,6 +5,8 @@ from typing import Any, Dict, List, Optional
 
 from homeassistant.components.climate import ClimateDevice
 from homeassistant.components.climate.const import (
+    CURRENT_HVAC_HEAT,
+    CURRENT_HVAC_IDLE,
     HVAC_MODE_HEAT,
     PRESET_AWAY,
     PRESET_COMFORT,
@@ -12,8 +14,6 @@ from homeassistant.components.climate.const import (
     PRESET_SLEEP,
     SUPPORT_PRESET_MODE,
     SUPPORT_TARGET_TEMPERATURE,
-    CURRENT_HVAC_HEAT,
-    CURRENT_HVAC_IDLE,
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import ATTR_TEMPERATURE, TEMP_CELSIUS
@@ -21,8 +21,8 @@ from homeassistant.helpers.typing import HomeAssistantType
 
 from . import ToonData, ToonDisplayDeviceEntity
 from .const import (
-    DATA_TOON_CLIENT,
     DATA_TOON,
+    DATA_TOON_CLIENT,
     DEFAULT_MAX_TEMP,
     DEFAULT_MIN_TEMP,
     DOMAIN,
diff --git a/homeassistant/components/toon/config_flow.py b/homeassistant/components/toon/config_flow.py
index 62c141b003a..ce4f347eaf2 100644
--- a/homeassistant/components/toon/config_flow.py
+++ b/homeassistant/components/toon/config_flow.py
@@ -1,8 +1,15 @@
 """Config flow to configure the Toon component."""
 from collections import OrderedDict
-import logging
 from functools import partial
+import logging
 
+from toonapilib import Toon
+from toonapilib.toonapilibexceptions import (
+    AgreementsRetrievalError,
+    InvalidConsumerKey,
+    InvalidConsumerSecret,
+    InvalidCredentials,
+)
 import voluptuous as vol
 
 from homeassistant import config_entries
@@ -67,13 +74,6 @@ class ToonFlowHandler(config_entries.ConfigFlow):
 
     async def async_step_authenticate(self, user_input=None):
         """Attempt to authenticate with the Toon account."""
-        from toonapilib import Toon
-        from toonapilib.toonapilibexceptions import (
-            InvalidConsumerSecret,
-            InvalidConsumerKey,
-            InvalidCredentials,
-            AgreementsRetrievalError,
-        )
 
         if user_input is None:
             return await self._show_authenticaticate_form()
@@ -129,7 +129,6 @@ class ToonFlowHandler(config_entries.ConfigFlow):
 
     async def async_step_display(self, user_input=None):
         """Select Toon display to add."""
-        from toonapilib import Toon
 
         if not self.displays:
             return self.async_abort(reason="no_displays")
diff --git a/homeassistant/components/toon/sensor.py b/homeassistant/components/toon/sensor.py
index f82bcb7ac1b..79a8fa28540 100644
--- a/homeassistant/components/toon/sensor.py
+++ b/homeassistant/components/toon/sensor.py
@@ -2,18 +2,18 @@
 import logging
 
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.helpers.typing import HomeAssistantType
 from homeassistant.const import ENERGY_KILO_WATT_HOUR, POWER_WATT
+from homeassistant.helpers.typing import HomeAssistantType
 
 from . import (
+    ToonBoilerDeviceEntity,
     ToonData,
-    ToonEntity,
     ToonElectricityMeterDeviceEntity,
+    ToonEntity,
     ToonGasMeterDeviceEntity,
     ToonSolarDeviceEntity,
-    ToonBoilerDeviceEntity,
 )
-from .const import CURRENCY_EUR, DATA_TOON, DOMAIN, VOLUME_CM3, VOLUME_M3, RATIO_PERCENT
+from .const import CURRENCY_EUR, DATA_TOON, DOMAIN, RATIO_PERCENT, VOLUME_CM3, VOLUME_M3
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/tests/components/toon/test_config_flow.py b/tests/components/toon/test_config_flow.py
index a4d7c760ca1..45d16908446 100644
--- a/tests/components/toon/test_config_flow.py
+++ b/tests/components/toon/test_config_flow.py
@@ -22,7 +22,7 @@ from homeassistant.components.toon.const import (
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 from homeassistant.setup import async_setup_component
 
-from tests.common import MockConfigEntry, MockDependency
+from tests.common import MockConfigEntry
 
 FIXTURE_APP = {
     DOMAIN: {CONF_CLIENT_ID: "1234567890abcdef", CONF_CLIENT_SECRET: "1234567890abcdef"}
@@ -40,9 +40,9 @@ FIXTURE_DISPLAY = {CONF_DISPLAY: "display1"}
 @pytest.fixture
 def mock_toonapilib():
     """Mock toonapilib."""
-    with MockDependency("toonapilib") as mock_toonapilib_:
-        mock_toonapilib_.Toon().display_names = [FIXTURE_DISPLAY[CONF_DISPLAY]]
-        yield mock_toonapilib_
+    with patch("homeassistant.components.toon.config_flow.Toon") as Toon:
+        Toon().display_names = [FIXTURE_DISPLAY[CONF_DISPLAY]]
+        yield Toon
 
 
 async def setup_component(hass):
@@ -90,7 +90,7 @@ async def test_toon_abort(hass, mock_toonapilib, side_effect, reason):
     flow = config_flow.ToonFlowHandler()
     flow.hass = hass
 
-    mock_toonapilib.Toon.side_effect = side_effect
+    mock_toonapilib.side_effect = side_effect
 
     result = await flow.async_step_authenticate(user_input=FIXTURE_CREDENTIALS)
 
@@ -100,7 +100,7 @@ async def test_toon_abort(hass, mock_toonapilib, side_effect, reason):
 
 async def test_invalid_credentials(hass, mock_toonapilib):
     """Test we show authentication form on Toon auth error."""
-    mock_toonapilib.Toon.side_effect = InvalidCredentials
+    mock_toonapilib.side_effect = InvalidCredentials
 
     await setup_component(hass)
 
@@ -140,7 +140,7 @@ async def test_no_displays(hass, mock_toonapilib):
     """Test abort when there are no displays."""
     await setup_component(hass)
 
-    mock_toonapilib.Toon().display_names = []
+    mock_toonapilib().display_names = []
 
     flow = config_flow.ToonFlowHandler()
     flow.hass = hass
@@ -177,7 +177,7 @@ async def test_abort_last_minute_fail(hass, mock_toonapilib):
     flow.hass = hass
     await flow.async_step_user(user_input=FIXTURE_CREDENTIALS)
 
-    mock_toonapilib.Toon.side_effect = Exception
+    mock_toonapilib.side_effect = Exception
 
     result = await flow.async_step_display(user_input=FIXTURE_DISPLAY)
     assert result["type"] == data_entry_flow.RESULT_TYPE_ABORT