diff --git a/homeassistant/components/letpot/quality_scale.yaml b/homeassistant/components/letpot/quality_scale.yaml
index 0eda413a461..70f3bb52b82 100644
--- a/homeassistant/components/letpot/quality_scale.yaml
+++ b/homeassistant/components/letpot/quality_scale.yaml
@@ -44,7 +44,7 @@ rules:
   log-when-unavailable: todo
   parallel-updates: done
   reauthentication-flow: done
-  test-coverage: todo
+  test-coverage: done
 
   # Gold
   devices: done
diff --git a/tests/components/letpot/test_init.py b/tests/components/letpot/test_init.py
index 178227a6506..e3f78d87dc1 100644
--- a/tests/components/letpot/test_init.py
+++ b/tests/components/letpot/test_init.py
@@ -2,7 +2,11 @@
 
 from unittest.mock import MagicMock
 
-from letpot.exceptions import LetPotAuthenticationException, LetPotConnectionException
+from letpot.exceptions import (
+    LetPotAuthenticationException,
+    LetPotConnectionException,
+    LetPotException,
+)
 import pytest
 
 from homeassistant.config_entries import ConfigEntryState
@@ -94,3 +98,34 @@ async def test_get_devices_exceptions(
     assert mock_config_entry.state is config_entry_state
     mock_client.get_devices.assert_called_once()
     mock_device_client.subscribe.assert_not_called()
+
+
+async def test_device_subscribe_authentication_exception(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_client: MagicMock,
+    mock_device_client: MagicMock,
+) -> None:
+    """Test config entry errors if it is not allowed to subscribe to device updates."""
+    mock_device_client.subscribe.side_effect = LetPotAuthenticationException
+
+    await setup_integration(hass, mock_config_entry)
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_ERROR
+    mock_device_client.subscribe.assert_called_once()
+    mock_device_client.get_current_status.assert_not_called()
+
+
+async def test_device_refresh_exception(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_client: MagicMock,
+    mock_device_client: MagicMock,
+) -> None:
+    """Test config entry errors with retry if getting a device state update fails."""
+    mock_device_client.get_current_status.side_effect = LetPotException
+
+    await setup_integration(hass, mock_config_entry)
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_RETRY
+    mock_device_client.get_current_status.assert_called_once()
diff --git a/tests/components/letpot/test_switch.py b/tests/components/letpot/test_switch.py
index b166d551adb..0ba1f556bc9 100644
--- a/tests/components/letpot/test_switch.py
+++ b/tests/components/letpot/test_switch.py
@@ -6,7 +6,11 @@ from letpot.exceptions import LetPotConnectionException, LetPotException
 import pytest
 from syrupy import SnapshotAssertion
 
-from homeassistant.components.switch import SERVICE_TURN_OFF, SERVICE_TURN_ON
+from homeassistant.components.switch import (
+    SERVICE_TOGGLE,
+    SERVICE_TURN_OFF,
+    SERVICE_TURN_ON,
+)
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError
@@ -32,6 +36,44 @@ async def test_all_entities(
     await snapshot_platform(hass, entity_registry, snapshot, mock_config_entry.entry_id)
 
 
+@pytest.mark.parametrize(
+    ("service", "parameter_value"),
+    [
+        (
+            SERVICE_TURN_ON,
+            True,
+        ),
+        (
+            SERVICE_TURN_OFF,
+            False,
+        ),
+        (
+            SERVICE_TOGGLE,
+            False,  # Mock switch is on after setup, toggle will turn off
+        ),
+    ],
+)
+async def test_set_switch(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_client: MagicMock,
+    mock_device_client: MagicMock,
+    service: str,
+    parameter_value: bool,
+) -> None:
+    """Test switch entity turned on/turned off/toggled."""
+    await setup_integration(hass, mock_config_entry)
+
+    await hass.services.async_call(
+        "switch",
+        service,
+        blocking=True,
+        target={"entity_id": "switch.garden_power"},
+    )
+
+    mock_device_client.set_power.assert_awaited_once_with(parameter_value)
+
+
 @pytest.mark.parametrize(
     ("service", "exception", "user_error"),
     [
diff --git a/tests/components/letpot/test_time.py b/tests/components/letpot/test_time.py
index 82e69979067..e65ea4532e1 100644
--- a/tests/components/letpot/test_time.py
+++ b/tests/components/letpot/test_time.py
@@ -33,6 +33,26 @@ async def test_all_entities(
     await snapshot_platform(hass, entity_registry, snapshot, mock_config_entry.entry_id)
 
 
+async def test_set_time(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_client: MagicMock,
+    mock_device_client: MagicMock,
+) -> None:
+    """Test setting the time entity."""
+    await setup_integration(hass, mock_config_entry)
+
+    await hass.services.async_call(
+        "time",
+        SERVICE_SET_VALUE,
+        service_data={"time": time(hour=7, minute=0)},
+        blocking=True,
+        target={"entity_id": "time.garden_light_on"},
+    )
+
+    mock_device_client.set_light_schedule.assert_awaited_once_with(time(7, 0), None)
+
+
 @pytest.mark.parametrize(
     ("exception", "user_error"),
     [