diff --git a/homeassistant/components/smarla/icons.json b/homeassistant/components/smarla/icons.json
index 20e7b4dcad1..5a31ec88822 100644
--- a/homeassistant/components/smarla/icons.json
+++ b/homeassistant/components/smarla/icons.json
@@ -1,7 +1,7 @@
 {
   "entity": {
     "switch": {
-      "smartmode": {
+      "smart_mode": {
         "default": "mdi:refresh-auto"
       }
     }
diff --git a/homeassistant/components/smarla/manifest.json b/homeassistant/components/smarla/manifest.json
index d8d6db28550..867a1e01337 100644
--- a/homeassistant/components/smarla/manifest.json
+++ b/homeassistant/components/smarla/manifest.json
@@ -8,5 +8,5 @@
   "iot_class": "cloud_push",
   "loggers": ["pysmarlaapi", "pysignalr"],
   "quality_scale": "bronze",
-  "requirements": ["pysmarlaapi==0.7.2"]
+  "requirements": ["pysmarlaapi==0.8.1"]
 }
diff --git a/homeassistant/components/smarla/quality_scale.yaml b/homeassistant/components/smarla/quality_scale.yaml
index 6d16f3dcc3e..99b6e0c608c 100644
--- a/homeassistant/components/smarla/quality_scale.yaml
+++ b/homeassistant/components/smarla/quality_scale.yaml
@@ -29,7 +29,7 @@ rules:
   log-when-unavailable: todo
   parallel-updates: todo
   reauthentication-flow: todo
-  test-coverage: todo
+  test-coverage: done
 
   # Gold
   devices: done
diff --git a/homeassistant/components/smarla/strings.json b/homeassistant/components/smarla/strings.json
index 116a139e2a3..8426bc30566 100644
--- a/homeassistant/components/smarla/strings.json
+++ b/homeassistant/components/smarla/strings.json
@@ -20,8 +20,8 @@
   },
   "entity": {
     "switch": {
-      "smartmode": {
-        "name": "Smart mode"
+      "smart_mode": {
+        "name": "Smart Mode"
       }
     }
   }
diff --git a/homeassistant/components/smarla/switch.py b/homeassistant/components/smarla/switch.py
index d0aa6ab1925..49bcce23b24 100644
--- a/homeassistant/components/smarla/switch.py
+++ b/homeassistant/components/smarla/switch.py
@@ -24,16 +24,16 @@ class SmarlaSwitchEntityDescription(SwitchEntityDescription):
 
 SWITCHES: list[SmarlaSwitchEntityDescription] = [
     SmarlaSwitchEntityDescription(
-        key="cradle",
+        key="swing_active",
         name=None,
         service="babywiege",
         property="swing_active",
     ),
     SmarlaSwitchEntityDescription(
-        key="smartmode",
-        translation_key="smartmode",
+        key="smart_mode",
+        translation_key="smart_mode",
         service="babywiege",
-        property="smartmode",
+        property="smart_mode",
     ),
 ]
 
diff --git a/requirements_all.txt b/requirements_all.txt
index a016625947c..34e9addff85 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2335,7 +2335,7 @@ pysma==0.7.5
 pysmappee==0.2.29
 
 # homeassistant.components.smarla
-pysmarlaapi==0.7.2
+pysmarlaapi==0.8.1
 
 # homeassistant.components.smartthings
 pysmartthings==3.2.2
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index e01398982b2..948c37039e5 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1908,7 +1908,7 @@ pysma==0.7.5
 pysmappee==0.2.29
 
 # homeassistant.components.smarla
-pysmarlaapi==0.7.2
+pysmarlaapi==0.8.1
 
 # homeassistant.components.smartthings
 pysmartthings==3.2.2
diff --git a/tests/components/smarla/__init__.py b/tests/components/smarla/__init__.py
index 5232b70a991..5bb8b70f030 100644
--- a/tests/components/smarla/__init__.py
+++ b/tests/components/smarla/__init__.py
@@ -18,5 +18,3 @@ MOCK_ACCESS_TOKEN = base64.b64encode(
 ).decode()
 
 MOCK_USER_INPUT = {CONF_ACCESS_TOKEN: MOCK_ACCESS_TOKEN}
-
-MOCK_URL = "https://someurl.net"
diff --git a/tests/components/smarla/common.py b/tests/components/smarla/common.py
new file mode 100644
index 00000000000..10cc0edbd2e
--- /dev/null
+++ b/tests/components/smarla/common.py
@@ -0,0 +1,11 @@
+"""Common test utilities for entity component tests."""
+
+from homeassistant.components.smarla.const import DOMAIN
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import entity_registry as er
+
+
+def get_entity_id_by_unique_id(hass: HomeAssistant, platform: str, unique_id: str):
+    """Get entity id by its unique id."""
+    registry = er.async_get(hass)
+    return registry.async_get_entity_id(platform, DOMAIN, unique_id)
diff --git a/tests/components/smarla/conftest.py b/tests/components/smarla/conftest.py
index bfc488822d2..5a43157ea68 100644
--- a/tests/components/smarla/conftest.py
+++ b/tests/components/smarla/conftest.py
@@ -11,7 +11,7 @@ import pytest
 from homeassistant.components.smarla.const import DOMAIN
 from homeassistant.config_entries import SOURCE_USER
 
-from . import MOCK_ACCESS_TOKEN_JSON, MOCK_SERIAL_NUMBER, MOCK_URL, MOCK_USER_INPUT
+from . import MOCK_ACCESS_TOKEN_JSON, MOCK_SERIAL_NUMBER, MOCK_USER_INPUT
 
 from tests.common import MockConfigEntry
 
@@ -49,7 +49,17 @@ def mock_connection() -> Generator[MagicMock]:
         ),
     ):
         connection = mock_connection.return_value
-        connection.url = MOCK_URL
         connection.token = AuthToken.from_json(MOCK_ACCESS_TOKEN_JSON)
         connection.refresh_token.return_value = True
         yield connection
+
+
+@pytest.fixture
+def mock_federwiege() -> Generator[MagicMock]:
+    """Mock the Federwiege instance."""
+    with patch(
+        "homeassistant.components.smarla.Federwiege", autospec=True
+    ) as mock_federwiege:
+        federwiege = mock_federwiege.return_value
+        federwiege.serial_number = MOCK_SERIAL_NUMBER
+        yield federwiege
diff --git a/tests/components/smarla/test_init.py b/tests/components/smarla/test_init.py
new file mode 100644
index 00000000000..097c929dff9
--- /dev/null
+++ b/tests/components/smarla/test_init.py
@@ -0,0 +1,25 @@
+"""Test switch platform for Swing2Sleep Smarla integration."""
+
+from unittest.mock import AsyncMock, patch
+
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
+
+async def test_init_invalid_auth(
+    hass: HomeAssistant, mock_config_entry: MockConfigEntry, mock_connection
+) -> None:
+    """Test init invalid authentication behavior."""
+    # Add the mock entry to hass
+    mock_config_entry.add_to_hass(hass)
+
+    with patch.object(
+        mock_connection, "refresh_token", new=AsyncMock(return_value=False)
+    ):
+        # Set up the platform
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_ERROR
diff --git a/tests/components/smarla/test_switch.py b/tests/components/smarla/test_switch.py
new file mode 100644
index 00000000000..00aeaec8124
--- /dev/null
+++ b/tests/components/smarla/test_switch.py
@@ -0,0 +1,72 @@
+"""Test switch platform for Swing2Sleep Smarla integration."""
+
+from pysmarlaapi.federwiege.classes import Property
+import pytest
+
+from homeassistant.components.smarla.switch import SWITCHES
+from homeassistant.components.switch import (
+    DOMAIN as SWITCH_DOMAIN,
+    SwitchEntityDescription,
+)
+from homeassistant.const import (
+    SERVICE_TURN_OFF,
+    SERVICE_TURN_ON,
+    STATE_OFF,
+    STATE_ON,
+    Platform,
+)
+from homeassistant.core import HomeAssistant
+
+from .common import get_entity_id_by_unique_id
+
+from tests.common import MockConfigEntry
+
+
+@pytest.mark.parametrize("switch_desc", SWITCHES)
+async def test_switch_behavior(
+    hass: HomeAssistant,
+    switch_desc: SwitchEntityDescription,
+    mock_config_entry: MockConfigEntry,
+    mock_connection,
+    mock_federwiege,
+) -> None:
+    """Test SmarlaSwitch on/off behavior."""
+    # Assign switch property to federwiege
+    mock_property = Property[bool](None, False)
+    mock_federwiege.get_property.return_value = mock_property
+    # Add the mock entry to hass
+    mock_config_entry.add_to_hass(hass)
+
+    # Set up the platform
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    # Get entity id by unique id
+    unique_id = f"{mock_federwiege.serial_number}-{switch_desc.key}"
+    entity_id = get_entity_id_by_unique_id(hass, Platform.SWITCH, unique_id)
+    assert entity_id is not None
+
+    # Check entity initial state
+    assert hass.states.get(entity_id).state == STATE_OFF
+
+    # Turn on
+    await hass.services.async_call(
+        SWITCH_DOMAIN,
+        SERVICE_TURN_ON,
+        {"entity_id": entity_id},
+        blocking=True,
+    )
+    mock_property.set(True, push=False)
+    await mock_property.notify_listeners()
+    assert hass.states.get(entity_id).state == STATE_ON
+
+    # Turn off
+    await hass.services.async_call(
+        SWITCH_DOMAIN,
+        SERVICE_TURN_OFF,
+        {"entity_id": entity_id},
+        blocking=True,
+    )
+    mock_property.set(False, push=False)
+    await mock_property.notify_listeners()
+    assert hass.states.get(entity_id).state == STATE_OFF