diff --git a/homeassistant/components/tradfri/switch.py b/homeassistant/components/tradfri/switch.py
index 72d311fe555..f8950d24720 100644
--- a/homeassistant/components/tradfri/switch.py
+++ b/homeassistant/components/tradfri/switch.py
@@ -43,6 +43,7 @@ class TradfriSwitch(TradfriBaseDevice, SwitchEntity):
         """Initialize a switch."""
         super().__init__(device, api, gateway_id)
         self._attr_unique_id = f"{gateway_id}-{device.id}"
+        self._refresh(device, write_ha=False)
 
     def _refresh(self, device: Command, write_ha: bool = True) -> None:
         """Refresh the switch data."""
diff --git a/tests/components/tradfri/test_switch.py b/tests/components/tradfri/test_switch.py
new file mode 100644
index 00000000000..11903dc9a42
--- /dev/null
+++ b/tests/components/tradfri/test_switch.py
@@ -0,0 +1,160 @@
+"""Tradfri switch (recognised as sockets in the IKEA ecosystem) platform tests."""
+
+from unittest.mock import MagicMock, Mock, PropertyMock, patch
+
+import pytest
+from pytradfri.device import Device
+from pytradfri.device.socket import Socket
+from pytradfri.device.socket_control import SocketControl
+
+from .common import setup_integration
+
+
+@pytest.fixture(autouse=True, scope="module")
+def setup(request):
+    """Set up patches for pytradfri methods."""
+    with patch(
+        "pytradfri.device.SocketControl.raw",
+        new_callable=PropertyMock,
+        return_value=[{"mock": "mock"}],
+    ), patch(
+        "pytradfri.device.SocketControl.sockets",
+    ):
+        yield
+
+
+def mock_switch(test_features=None, test_state=None, device_number=0):
+    """Mock a tradfri switch/socket."""
+    if test_features is None:
+        test_features = {}
+    if test_state is None:
+        test_state = {}
+    mock_switch_data = Mock(**test_state)
+
+    dev_info_mock = MagicMock()
+    dev_info_mock.manufacturer = "manufacturer"
+    dev_info_mock.model_number = "model"
+    dev_info_mock.firmware_version = "1.2.3"
+    _mock_switch = Mock(
+        id=f"mock-switch-id-{device_number}",
+        reachable=True,
+        observe=Mock(),
+        device_info=dev_info_mock,
+        has_light_control=False,
+        has_socket_control=True,
+        has_blind_control=False,
+        has_signal_repeater_control=False,
+        has_air_purifier_control=False,
+    )
+    _mock_switch.name = f"tradfri_switch_{device_number}"
+    socket_control = SocketControl(_mock_switch)
+
+    # Store the initial state.
+    setattr(socket_control, "sockets", [mock_switch_data])
+    _mock_switch.socket_control = socket_control
+    return _mock_switch
+
+
+async def test_switch(hass, mock_gateway, mock_api_factory):
+    """Test that switches are correctly added."""
+    state = {
+        "state": True,
+    }
+
+    mock_gateway.mock_devices.append(mock_switch(test_state=state))
+    await setup_integration(hass)
+
+    switch_1 = hass.states.get("switch.tradfri_switch_0")
+    assert switch_1 is not None
+    assert switch_1.state == "on"
+
+
+async def test_switch_observed(hass, mock_gateway, mock_api_factory):
+    """Test that switches are correctly observed."""
+    state = {
+        "state": True,
+    }
+
+    switch = mock_switch(test_state=state)
+    mock_gateway.mock_devices.append(switch)
+    await setup_integration(hass)
+    assert len(switch.observe.mock_calls) > 0
+
+
+async def test_switch_available(hass, mock_gateway, mock_api_factory):
+    """Test switch available property."""
+
+    switch = mock_switch(test_state={"state": True}, device_number=1)
+    switch.reachable = True
+
+    switch2 = mock_switch(test_state={"state": True}, device_number=2)
+    switch2.reachable = False
+
+    mock_gateway.mock_devices.append(switch)
+    mock_gateway.mock_devices.append(switch2)
+    await setup_integration(hass)
+
+    assert hass.states.get("switch.tradfri_switch_1").state == "on"
+    assert hass.states.get("switch.tradfri_switch_2").state == "unavailable"
+
+
+@pytest.mark.parametrize(
+    "test_data, expected_result",
+    [
+        (
+            "turn_on",
+            "on",
+        ),
+        ("turn_off", "off"),
+    ],
+)
+async def test_turn_on_off(
+    hass,
+    mock_gateway,
+    mock_api_factory,
+    test_data,
+    expected_result,
+):
+    """Test turning switch on/off."""
+    # Note pytradfri style, not hass. Values not really important.
+    initial_state = {
+        "state": True,
+    }
+
+    # Setup the gateway with a mock switch.
+    switch = mock_switch(test_state=initial_state, device_number=0)
+    mock_gateway.mock_devices.append(switch)
+    await setup_integration(hass)
+
+    # Use the turn_on/turn_off service call to change the switch state.
+    await hass.services.async_call(
+        "switch",
+        test_data,
+        {
+            "entity_id": "switch.tradfri_switch_0",
+        },
+        blocking=True,
+    )
+    await hass.async_block_till_done()
+
+    # Check that the switch is observed.
+    mock_func = switch.observe
+    assert len(mock_func.mock_calls) > 0
+    _, callkwargs = mock_func.call_args
+    assert "callback" in callkwargs
+    # Callback function to refresh switch state.
+    callback = callkwargs["callback"]
+
+    responses = mock_gateway.mock_responses
+    mock_gateway_response = responses[0]
+
+    # Use the callback function to update the switch state.
+    dev = Device(mock_gateway_response)
+    switch_data = Socket(dev, 0)
+    switch.socket_control.sockets[0] = switch_data
+    callback(switch)
+    await hass.async_block_till_done()
+
+    # Check that the state is correct.
+    state = hass.states.get("switch.tradfri_switch_0")
+    assert state.state == expected_result