diff --git a/kasa/tests/device_fixtures.py b/kasa/tests/device_fixtures.py
index 71cc34bd..9d01a830 100644
--- a/kasa/tests/device_fixtures.py
+++ b/kasa/tests/device_fixtures.py
@@ -376,7 +376,7 @@ async def get_device_for_fixture(fixture_data: FixtureInfo):
             "system": {"get_sysinfo": fixture_data.data["system"]["get_sysinfo"]}
         }
 
-    if discovery_data: # Child devices do not have discovery info
+    if discovery_data:  # Child devices do not have discovery info
         d.update_from_discover_info(discovery_data)
 
     await _update_and_close(d)
diff --git a/kasa/tests/smart/modules/test_humidity.py b/kasa/tests/smart/modules/test_humidity.py
index 99e4702e..bf746f2b 100644
--- a/kasa/tests/smart/modules/test_humidity.py
+++ b/kasa/tests/smart/modules/test_humidity.py
@@ -3,7 +3,9 @@ import pytest
 from kasa.smart.modules import HumiditySensor
 from kasa.tests.device_fixtures import parametrize
 
-humidity = parametrize("has humidity", component_filter="humidity", protocol_filter={"SMART.CHILD"})
+humidity = parametrize(
+    "has humidity", component_filter="humidity", protocol_filter={"SMART.CHILD"}
+)
 
 
 @humidity
diff --git a/kasa/tests/smart/modules/test_temperature.py b/kasa/tests/smart/modules/test_temperature.py
index 649b5bc4..3b9ab50e 100644
--- a/kasa/tests/smart/modules/test_temperature.py
+++ b/kasa/tests/smart/modules/test_temperature.py
@@ -3,7 +3,9 @@ import pytest
 from kasa.smart.modules import TemperatureSensor
 from kasa.tests.device_fixtures import parametrize
 
-temperature = parametrize("has temperature", component_filter="temperature", protocol_filter={"SMART.CHILD"})
+temperature = parametrize(
+    "has temperature", component_filter="temperature", protocol_filter={"SMART.CHILD"}
+)
 
 
 @temperature
diff --git a/kasa/tests/test_bulb.py b/kasa/tests/test_bulb.py
index e8c95dbd..48b5976e 100644
--- a/kasa/tests/test_bulb.py
+++ b/kasa/tests/test_bulb.py
@@ -24,7 +24,7 @@ from .conftest import (
     variable_temp,
     variable_temp_iot,
 )
-from .test_smartdevice import SYSINFO_SCHEMA
+from .test_iotdevice import SYSINFO_SCHEMA
 
 
 @bulb
@@ -370,3 +370,10 @@ SYSINFO_SCHEMA_BULB = SYSINFO_SCHEMA.extend(
         ],
     }
 )
+
+
+@bulb
+def test_device_type_bulb(dev):
+    if dev.is_light_strip:
+        pytest.skip("bulb has also lightstrips to test the api")
+    assert dev.device_type == DeviceType.Bulb
diff --git a/kasa/tests/test_device.py b/kasa/tests/test_device.py
new file mode 100644
index 00000000..7ceab8e9
--- /dev/null
+++ b/kasa/tests/test_device.py
@@ -0,0 +1,121 @@
+"""Tests for all devices."""
+import importlib
+import inspect
+import pkgutil
+import sys
+from unittest.mock import Mock, patch
+
+import pytest
+
+import kasa
+from kasa import Credentials, Device, DeviceConfig
+from kasa.iot import IotDevice
+from kasa.smart import SmartChildDevice, SmartDevice
+
+
+def _get_subclasses(of_class):
+    package = sys.modules["kasa"]
+    subclasses = set()
+    for _, modname, _ in pkgutil.iter_modules(package.__path__):
+        importlib.import_module("." + modname, package="kasa")
+        module = sys.modules["kasa." + modname]
+        for name, obj in inspect.getmembers(module):
+            if (
+                inspect.isclass(obj)
+                and issubclass(obj, of_class)
+                and module.__package__ != "kasa"
+            ):
+                subclasses.add((module.__package__ + "." + name, obj))
+    return subclasses
+
+
+device_classes = pytest.mark.parametrize(
+    "device_class_name_obj", _get_subclasses(Device), ids=lambda t: t[0]
+)
+
+
+async def test_alias(dev):
+    test_alias = "TEST1234"
+    original = dev.alias
+
+    assert isinstance(original, str)
+    await dev.set_alias(test_alias)
+    await dev.update()
+    assert dev.alias == test_alias
+
+    await dev.set_alias(original)
+    await dev.update()
+    assert dev.alias == original
+
+
+@device_classes
+async def test_device_class_ctors(device_class_name_obj):
+    """Make sure constructor api not broken for new and existing SmartDevices."""
+    host = "127.0.0.2"
+    port = 1234
+    credentials = Credentials("foo", "bar")
+    config = DeviceConfig(host, port_override=port, credentials=credentials)
+    klass = device_class_name_obj[1]
+    if issubclass(klass, SmartChildDevice):
+        parent = SmartDevice(host, config=config)
+        dev = klass(
+            parent, {"dummy": "info", "device_id": "dummy"}, {"dummy": "components"}
+        )
+    else:
+        dev = klass(host, config=config)
+    assert dev.host == host
+    assert dev.port == port
+    assert dev.credentials == credentials
+
+
+async def test_create_device_with_timeout():
+    """Make sure timeout is passed to the protocol."""
+    host = "127.0.0.1"
+    dev = IotDevice(host, config=DeviceConfig(host, timeout=100))
+    assert dev.protocol._transport._timeout == 100
+    dev = SmartDevice(host, config=DeviceConfig(host, timeout=100))
+    assert dev.protocol._transport._timeout == 100
+
+
+async def test_create_thin_wrapper():
+    """Make sure thin wrapper is created with the correct device type."""
+    mock = Mock()
+    config = DeviceConfig(
+        host="test_host",
+        port_override=1234,
+        timeout=100,
+        credentials=Credentials("username", "password"),
+    )
+    with patch("kasa.device_factory.connect", return_value=mock) as connect:
+        dev = await Device.connect(config=config)
+        assert dev is mock
+
+    connect.assert_called_once_with(
+        host=None,
+        config=config,
+    )
+
+
+@pytest.mark.parametrize(
+    "device_class, use_class", kasa.deprecated_smart_devices.items()
+)
+def test_deprecated_devices(device_class, use_class):
+    package_name = ".".join(use_class.__module__.split(".")[:-1])
+    msg = f"{device_class} is deprecated, use {use_class.__name__} from package {package_name} instead"
+    with pytest.deprecated_call(match=msg):
+        getattr(kasa, device_class)
+    packages = package_name.split(".")
+    module = __import__(packages[0])
+    for _ in packages[1:]:
+        module = importlib.import_module(package_name, package=module.__name__)
+    getattr(module, use_class.__name__)
+
+
+@pytest.mark.parametrize(
+    "exceptions_class, use_class", kasa.deprecated_exceptions.items()
+)
+def test_deprecated_exceptions(exceptions_class, use_class):
+    msg = f"{exceptions_class} is deprecated, use {use_class.__name__} instead"
+    with pytest.deprecated_call(match=msg):
+        getattr(kasa, exceptions_class)
+    getattr(kasa, use_class.__name__)
diff --git a/kasa/tests/test_dimmer.py b/kasa/tests/test_dimmer.py
index fafa9544..d63aa453 100644
--- a/kasa/tests/test_dimmer.py
+++ b/kasa/tests/test_dimmer.py
@@ -1,5 +1,6 @@
 import pytest
 
+from kasa import DeviceType
 from kasa.iot import IotDimmer
 
 from .conftest import dimmer, handle_turn_on, turn_on
@@ -132,3 +133,8 @@ async def test_set_dimmer_transition_invalid(dev):
     for invalid_transition in [-1, 0, 0.5]:
         with pytest.raises(ValueError):
             await dev.set_dimmer_transition(1, invalid_transition)
+
+
+@dimmer
+def test_device_type_dimmer(dev):
+    assert dev.device_type == DeviceType.Dimmer
diff --git a/kasa/tests/test_iotdevice.py b/kasa/tests/test_iotdevice.py
new file mode 100644
index 00000000..b7846e41
--- /dev/null
+++ b/kasa/tests/test_iotdevice.py
@@ -0,0 +1,259 @@
+"""Module for common iotdevice tests."""
+import re
+from datetime import datetime
+
+import pytest
+from voluptuous import (
+    REMOVE_EXTRA,
+    All,
+    Any,
+    Boolean,
+    In,
+    Invalid,
+    Optional,
+    Range,
+    Schema,
+)
+
+from kasa import KasaException
+from kasa.iot import IotDevice
+
+from .conftest import handle_turn_on, turn_on
+from .device_fixtures import device_iot, has_emeter_iot, no_emeter_iot
+from .fakeprotocol_iot import FakeIotProtocol
+
+TZ_SCHEMA = Schema(
+    {"zone_str": str, "dst_offset": int, "index": All(int, Range(min=0)), "tz_str": str}
+)
+
+
+def check_mac(x):
+    if re.match("[0-9a-f]{2}([-:])[0-9a-f]{2}(\\1[0-9a-f]{2}){4}$", x.lower()):
+        return x
+    raise Invalid(x)
+
+
+SYSINFO_SCHEMA = Schema(
+    {
+        "active_mode": In(["schedule", "none", "count_down"]),
+        "alias": str,
+        "dev_name": str,
+        "deviceId": str,
+        "feature": str,
+        "fwId": str,
+        "hwId": str,
+        "hw_ver": str,
+        "icon_hash": str,
+        "led_off": Boolean,
+        "latitude": Any(All(float, Range(min=-90, max=90)), 0, None),
+        "latitude_i": Any(
+            All(int, Range(min=-900000, max=900000)),
+            All(float, Range(min=-900000, max=900000)),
+            0,
+            None,
+        ),
+        "longitude": Any(All(float, Range(min=-180, max=180)), 0, None),
+        "longitude_i": Any(
+            All(int, Range(min=-18000000, max=18000000)),
+            All(float, Range(min=-18000000, max=18000000)),
+            0,
+            None,
+        ),
+        "mac": check_mac,
+        "model": str,
+        "oemId": str,
+        "on_time": int,
+        "relay_state": int,
+        "rssi": Any(int, None),  # rssi can also be positive, see #54
+        "sw_ver": str,
+        "type": str,
+        "mic_type": str,
+        "updating": Boolean,
+        # these are available on hs220
+        "brightness": int,
+        "preferred_state": [
+            {"brightness": All(int, Range(min=0, max=100)), "index": int}
+        ],
+        "next_action": {"type": int},
+        "child_num": Optional(Any(None, int)),
+        "children": Optional(list),
+    },
+    extra=REMOVE_EXTRA,
+)
+
+
+@device_iot
+async def test_state_info(dev):
+    assert isinstance(dev.state_information, dict)
+
+
+@pytest.mark.requires_dummy
+@device_iot
+async def test_invalid_connection(mocker, dev):
+    with mocker.patch.object(
+        FakeIotProtocol, "query", side_effect=KasaException
+    ), pytest.raises(KasaException):
+        await dev.update()
+
+
+@has_emeter_iot
+async def test_initial_update_emeter(dev, mocker):
+    """Test that the initial update performs second query if emeter is available."""
+    dev._last_update = None
+    dev._legacy_features = set()
+    spy = mocker.spy(dev.protocol, "query")
+    await dev.update()
+    # Devices with small buffers may require 3 queries
+    expected_queries = 2 if dev.max_device_response_size > 4096 else 3
+    assert spy.call_count == expected_queries + len(dev.children)
+
+
+@no_emeter_iot
+async def test_initial_update_no_emeter(dev, mocker):
+    """Test that the initial update performs second query if emeter is available."""
+    dev._last_update = None
+    dev._legacy_features = set()
+    spy = mocker.spy(dev.protocol, "query")
+    await dev.update()
+    # 2 calls are necessary as some devices crash on unexpected modules
+    # See #105, #120, #161
+    assert spy.call_count == 2
+
+
+@device_iot
+async def test_query_helper(dev):
+    with pytest.raises(KasaException):
+        await dev._query_helper("test", "testcmd", {})
+    # TODO check for unwrapping?
+
+
+@device_iot
+@turn_on
+async def test_state(dev, turn_on):
+    await handle_turn_on(dev, turn_on)
+    orig_state = dev.is_on
+    if orig_state:
+        await dev.turn_off()
+        await dev.update()
+        assert not dev.is_on
+        assert dev.is_off
+
+        await dev.turn_on()
+        await dev.update()
+        assert dev.is_on
+        assert not dev.is_off
+    else:
+        await dev.turn_on()
+        await dev.update()
+        assert dev.is_on
+        assert not dev.is_off
+
+        await dev.turn_off()
+        await dev.update()
+        assert not dev.is_on
+        assert dev.is_off
+
+
+@device_iot
+@turn_on
+async def test_on_since(dev, turn_on):
+    await handle_turn_on(dev, turn_on)
+    orig_state = dev.is_on
+    if "on_time" not in dev.sys_info and not dev.is_strip:
+        assert dev.on_since is None
+    elif orig_state:
+        assert isinstance(dev.on_since, datetime)
+    else:
+        assert dev.on_since is None
+
+
+@device_iot
+async def test_time(dev):
+    assert isinstance(await dev.get_time(), datetime)
+
+
+@device_iot
+async def test_timezone(dev):
+    TZ_SCHEMA(await dev.get_timezone())
+
+
+@device_iot
+async def test_hw_info(dev):
+    SYSINFO_SCHEMA(dev.hw_info)
+
+
+@device_iot
+async def test_location(dev):
+    SYSINFO_SCHEMA(dev.location)
+
+
+@device_iot
+async def test_rssi(dev):
+    SYSINFO_SCHEMA({"rssi": dev.rssi})  # wrapping for vol
+
+
+@device_iot
+async def test_mac(dev):
+    SYSINFO_SCHEMA({"mac": dev.mac})  # wrapping for val
+
+
+@device_iot
+async def test_representation(dev):
+    pattern = re.compile("<DeviceType\..+ at .+? - .*? \(.+?\)>")
+    assert pattern.match(str(dev))
+
+
+@device_iot
+async def test_children(dev):
+    """Make sure that children property is exposed by every device."""
+    if dev.is_strip:
+        assert len(dev.children) > 0
+    else:
+        assert len(dev.children) == 0
+
+
+@device_iot
+async def test_modules_preserved(dev: IotDevice):
+    """Make modules that are not being updated are preserved between updates."""
+    dev._last_update["some_module_not_being_updated"] = "should_be_kept"
+    await dev.update()
+    assert dev._last_update["some_module_not_being_updated"] == "should_be_kept"
+
+
+@device_iot
+async def test_internal_state(dev):
+    """Make sure the internal state returns the last update results."""
+    assert dev.internal_state == dev._last_update
+
+
+@device_iot
+async def test_features(dev):
+    """Make sure features is always accessible."""
+    sysinfo = dev._last_update["system"]["get_sysinfo"]
+    if "feature" in sysinfo:
+        assert dev._legacy_features == set(sysinfo["feature"].split(":"))
+    else:
+        assert dev._legacy_features == set()
+
+
+@device_iot
+async def test_max_device_response_size(dev):
+    """Make sure every device return has a set max response size."""
+    assert dev.max_device_response_size > 0
+
+
+@device_iot
+async def test_estimated_response_sizes(dev):
+    """Make sure every module has an estimated response size set."""
+    for mod in dev.modules.values():
+        assert mod.estimated_query_response_size > 0
+
+
+@device_iot
+async def test_modules_not_supported(dev: IotDevice):
+    """Test that unsupported modules do not break the device."""
+    for module in dev.modules.values():
+        assert module.is_supported is not None
+    await dev.update()
+    for module in dev.modules.values():
+        assert module.is_supported is not None
diff --git a/kasa/tests/test_lightstrip.py b/kasa/tests/test_lightstrip.py
index 123360a4..fcc48dfa 100644
--- a/kasa/tests/test_lightstrip.py
+++ b/kasa/tests/test_lightstrip.py
@@ -71,3 +71,8 @@ async def test_effects_lightstrip_set_effect_transition(
 async def test_effects_lightstrip_has_effects(dev: IotLightStrip):
     assert dev.has_effects is True
     assert dev.effect_list
+
+
+@lightstrip
+def test_device_type_lightstrip(dev):
+    assert dev.device_type == DeviceType.LightStrip
diff --git a/kasa/tests/test_plug.py b/kasa/tests/test_plug.py
index 9ccf3d04..8989c975 100644
--- a/kasa/tests/test_plug.py
+++ b/kasa/tests/test_plug.py
@@ -1,7 +1,7 @@
 from kasa import DeviceType
 
-from .conftest import plug_iot, plug_smart, switch_smart, wallswitch_iot
-from .test_smartdevice import SYSINFO_SCHEMA
+from .conftest import plug, plug_iot, plug_smart, switch_smart, wallswitch_iot
+from .test_iotdevice import SYSINFO_SCHEMA
 
 # these schemas should go to the mainlib as
 # they can be useful when adding support for new features/devices
@@ -76,3 +76,8 @@ async def test_switch_device_info(dev):
     assert (
         dev.device_type == DeviceType.WallSwitch or dev.device_type == DeviceType.Dimmer
     )
+
+
+@plug
+def test_device_type_plug(dev):
+    assert dev.device_type == DeviceType.Plug
diff --git a/kasa/tests/test_smartdevice.py b/kasa/tests/test_smartdevice.py
index fdd342ca..a9871fa2 100644
--- a/kasa/tests/test_smartdevice.py
+++ b/kasa/tests/test_smartdevice.py
@@ -1,317 +1,16 @@
-import importlib
-import inspect
+"""Tests for SMART devices."""
 import logging
-import pkgutil
-import re
-import sys
-from datetime import datetime
-from unittest.mock import Mock, patch
+from unittest.mock import patch
 
 import pytest  # type: ignore # https://github.com/pytest-dev/pytest/issues/3342
-from voluptuous import (
-    REMOVE_EXTRA,
-    All,
-    Any,
-    Boolean,
-    In,
-    Invalid,
-    Optional,
-    Range,
-    Schema,
-)
 
-import kasa
-from kasa import Credentials, Device, DeviceConfig, KasaException
-from kasa.device_type import DeviceType
+from kasa import KasaException
 from kasa.exceptions import SmartErrorCode
-from kasa.iot import IotDevice
-from kasa.smart import SmartChildDevice, SmartDevice
+from kasa.smart import SmartDevice
 
 from .conftest import (
-    bulb,
-    device_iot,
     device_smart,
-    dimmer,
-    handle_turn_on,
-    has_emeter_iot,
-    lightstrip,
-    no_emeter_iot,
-    plug,
-    strip,
-    turn_on,
 )
-from .fakeprotocol_iot import FakeIotProtocol
-
-
-def _get_subclasses(of_class):
-    package = sys.modules["kasa"]
-    subclasses = set()
-    for _, modname, _ in pkgutil.iter_modules(package.__path__):
-        importlib.import_module("." + modname, package="kasa")
-        module = sys.modules["kasa." + modname]
-        for name, obj in inspect.getmembers(module):
-            if (
-                inspect.isclass(obj)
-                and issubclass(obj, of_class)
-                and module.__package__ != "kasa"
-            ):
-                subclasses.add((module.__package__ + "." + name, obj))
-    return subclasses
-
-
-device_classes = pytest.mark.parametrize(
-    "device_class_name_obj", _get_subclasses(Device), ids=lambda t: t[0]
-)
-
-
-@device_iot
-async def test_state_info(dev):
-    assert isinstance(dev.state_information, dict)
-
-
-@pytest.mark.requires_dummy
-@device_iot
-async def test_invalid_connection(dev):
-    with patch.object(
-        FakeIotProtocol, "query", side_effect=KasaException
-    ), pytest.raises(KasaException):
-        await dev.update()
-
-
-@has_emeter_iot
-async def test_initial_update_emeter(dev, mocker):
-    """Test that the initial update performs second query if emeter is available."""
-    dev._last_update = None
-    dev._legacy_features = set()
-    spy = mocker.spy(dev.protocol, "query")
-    await dev.update()
-    # Devices with small buffers may require 3 queries
-    expected_queries = 2 if dev.max_device_response_size > 4096 else 3
-    assert spy.call_count == expected_queries + len(dev.children)
-
-
-@no_emeter_iot
-async def test_initial_update_no_emeter(dev, mocker):
-    """Test that the initial update performs second query if emeter is available."""
-    dev._last_update = None
-    dev._legacy_features = set()
-    spy = mocker.spy(dev.protocol, "query")
-    await dev.update()
-    # 2 calls are necessary as some devices crash on unexpected modules
-    # See #105, #120, #161
-    assert spy.call_count == 2
-
-
-@device_iot
-async def test_query_helper(dev):
-    with pytest.raises(KasaException):
-        await dev._query_helper("test", "testcmd", {})
-    # TODO check for unwrapping?
-
-
-@device_iot
-@turn_on
-async def test_state(dev, turn_on):
-    await handle_turn_on(dev, turn_on)
-    orig_state = dev.is_on
-    if orig_state:
-        await dev.turn_off()
-        await dev.update()
-        assert not dev.is_on
-        assert dev.is_off
-
-        await dev.turn_on()
-        await dev.update()
-        assert dev.is_on
-        assert not dev.is_off
-    else:
-        await dev.turn_on()
-        await dev.update()
-        assert dev.is_on
-        assert not dev.is_off
-
-        await dev.turn_off()
-        await dev.update()
-        assert not dev.is_on
-        assert dev.is_off
-
-
-@device_iot
-async def test_alias(dev):
-    test_alias = "TEST1234"
-    original = dev.alias
-
-    assert isinstance(original, str)
-    await dev.set_alias(test_alias)
-    await dev.update()
-    assert dev.alias == test_alias
-
-    await dev.set_alias(original)
-    await dev.update()
-    assert dev.alias == original
-
-
-@device_iot
-@turn_on
-async def test_on_since(dev, turn_on):
-    await handle_turn_on(dev, turn_on)
-    orig_state = dev.is_on
-    if "on_time" not in dev.sys_info and not dev.is_strip:
-        assert dev.on_since is None
-    elif orig_state:
-        assert isinstance(dev.on_since, datetime)
-    else:
-        assert dev.on_since is None
-
-
-@device_iot
-async def test_time(dev):
-    assert isinstance(await dev.get_time(), datetime)
-
-
-@device_iot
-async def test_timezone(dev):
-    TZ_SCHEMA(await dev.get_timezone())
-
-
-@device_iot
-async def test_hw_info(dev):
-    SYSINFO_SCHEMA(dev.hw_info)
-
-
-@device_iot
-async def test_location(dev):
-    SYSINFO_SCHEMA(dev.location)
-
-
-@device_iot
-async def test_rssi(dev):
-    SYSINFO_SCHEMA({"rssi": dev.rssi})  # wrapping for vol
-
-
-@device_iot
-async def test_mac(dev):
-    SYSINFO_SCHEMA({"mac": dev.mac})  # wrapping for val
-
-
-@device_iot
-async def test_representation(dev):
-    import re
-
-    pattern = re.compile("<DeviceType\..+ at .+? - .*? \(.+?\)>")
-    assert pattern.match(str(dev))
-
-
-@strip
-def test_children_api(dev):
-    """Test the child device API."""
-    first = dev.children[0]
-    first_by_get_child_device = dev.get_child_device(first.device_id)
-    assert first == first_by_get_child_device
-
-
-@device_iot
-async def test_children(dev):
-    """Make sure that children property is exposed by every device."""
-    if dev.is_strip:
-        assert len(dev.children) > 0
-    else:
-        assert len(dev.children) == 0
-
-
-@device_iot
-async def test_internal_state(dev):
-    """Make sure the internal state returns the last update results."""
-    assert dev.internal_state == dev._last_update
-
-
-@device_iot
-async def test_features(dev):
-    """Make sure features is always accessible."""
-    sysinfo = dev._last_update["system"]["get_sysinfo"]
-    if "feature" in sysinfo:
-        assert dev._legacy_features == set(sysinfo["feature"].split(":"))
-    else:
-        assert dev._legacy_features == set()
-
-
-@device_iot
-async def test_max_device_response_size(dev):
-    """Make sure every device return has a set max response size."""
-    assert dev.max_device_response_size > 0
-
-
-@device_iot
-async def test_estimated_response_sizes(dev):
-    """Make sure every module has an estimated response size set."""
-    for mod in dev.modules.values():
-        assert mod.estimated_query_response_size > 0
-
-
-@device_classes
-async def test_device_class_ctors(device_class_name_obj):
-    """Make sure constructor api not broken for new and existing SmartDevices."""
-    host = "127.0.0.2"
-    port = 1234
-    credentials = Credentials("foo", "bar")
-    config = DeviceConfig(host, port_override=port, credentials=credentials)
-    klass = device_class_name_obj[1]
-    if issubclass(klass, SmartChildDevice):
-        parent = SmartDevice(host, config=config)
-        dev = klass(
-            parent, {"dummy": "info", "device_id": "dummy"}, {"dummy": "components"}
-        )
-    else:
-        dev = klass(host, config=config)
-    assert dev.host == host
-    assert dev.port == port
-    assert dev.credentials == credentials
-
-
-@device_iot
-async def test_modules_preserved(dev: IotDevice):
-    """Make modules that are not being updated are preserved between updates."""
-    dev._last_update["some_module_not_being_updated"] = "should_be_kept"
-    await dev.update()
-    assert dev._last_update["some_module_not_being_updated"] == "should_be_kept"
-
-
-async def test_create_smart_device_with_timeout():
-    """Make sure timeout is passed to the protocol."""
-    host = "127.0.0.1"
-    dev = IotDevice(host, config=DeviceConfig(host, timeout=100))
-    assert dev.protocol._transport._timeout == 100
-    dev = SmartDevice(host, config=DeviceConfig(host, timeout=100))
-    assert dev.protocol._transport._timeout == 100
-
-
-async def test_create_thin_wrapper():
-    """Make sure thin wrapper is created with the correct device type."""
-    mock = Mock()
-    config = DeviceConfig(
-        host="test_host",
-        port_override=1234,
-        timeout=100,
-        credentials=Credentials("username", "password"),
-    )
-    with patch("kasa.device_factory.connect", return_value=mock) as connect:
-        dev = await Device.connect(config=config)
-        assert dev is mock
-
-    connect.assert_called_once_with(
-        host=None,
-        config=config,
-    )
-
-
-@device_iot
-async def test_modules_not_supported(dev: IotDevice):
-    """Test that unsupported modules do not break the device."""
-    for module in dev.modules.values():
-        assert module.is_supported is not None
-    await dev.update()
-    for module in dev.modules.values():
-        assert module.is_supported is not None
 
 
 @device_smart
@@ -336,110 +35,3 @@ async def test_update_no_device_info(dev: SmartDevice):
         KasaException, match=msg
     ):
         await dev.update()
-
-
-@pytest.mark.parametrize(
-    "device_class, use_class", kasa.deprecated_smart_devices.items()
-)
-def test_deprecated_devices(device_class, use_class):
-    package_name = ".".join(use_class.__module__.split(".")[:-1])
-    msg = f"{device_class} is deprecated, use {use_class.__name__} from package {package_name} instead"
-    with pytest.deprecated_call(match=msg):
-        getattr(kasa, device_class)
-    packages = package_name.split(".")
-    module = __import__(packages[0])
-    for _ in packages[1:]:
-        module = importlib.import_module(package_name, package=module.__name__)
-    getattr(module, use_class.__name__)
-
-
-@pytest.mark.parametrize(
-    "exceptions_class, use_class", kasa.deprecated_exceptions.items()
-)
-def test_deprecated_exceptions(exceptions_class, use_class):
-    msg = f"{exceptions_class} is deprecated, use {use_class.__name__} instead"
-    with pytest.deprecated_call(match=msg):
-        getattr(kasa, exceptions_class)
-    getattr(kasa, use_class.__name__)
-
-
-def check_mac(x):
-    if re.match("[0-9a-f]{2}([-:])[0-9a-f]{2}(\\1[0-9a-f]{2}){4}$", x.lower()):
-        return x
-    raise Invalid(x)
-
-
-TZ_SCHEMA = Schema(
-    {"zone_str": str, "dst_offset": int, "index": All(int, Range(min=0)), "tz_str": str}
-)
-
-
-SYSINFO_SCHEMA = Schema(
-    {
-        "active_mode": In(["schedule", "none", "count_down"]),
-        "alias": str,
-        "dev_name": str,
-        "deviceId": str,
-        "feature": str,
-        "fwId": str,
-        "hwId": str,
-        "hw_ver": str,
-        "icon_hash": str,
-        "led_off": Boolean,
-        "latitude": Any(All(float, Range(min=-90, max=90)), 0, None),
-        "latitude_i": Any(
-            All(int, Range(min=-900000, max=900000)),
-            All(float, Range(min=-900000, max=900000)),
-            0,
-            None,
-        ),
-        "longitude": Any(All(float, Range(min=-180, max=180)), 0, None),
-        "longitude_i": Any(
-            All(int, Range(min=-18000000, max=18000000)),
-            All(float, Range(min=-18000000, max=18000000)),
-            0,
-            None,
-        ),
-        "mac": check_mac,
-        "model": str,
-        "oemId": str,
-        "on_time": int,
-        "relay_state": int,
-        "rssi": Any(int, None),  # rssi can also be positive, see #54
-        "sw_ver": str,
-        "type": str,
-        "mic_type": str,
-        "updating": Boolean,
-        # these are available on hs220
-        "brightness": int,
-        "preferred_state": [
-            {"brightness": All(int, Range(min=0, max=100)), "index": int}
-        ],
-        "next_action": {"type": int},
-        "child_num": Optional(Any(None, int)),
-        "children": Optional(list),
-    },
-    extra=REMOVE_EXTRA,
-)
-
-
-@dimmer
-def test_device_type_dimmer(dev):
-    assert dev.device_type == DeviceType.Dimmer
-
-
-@bulb
-def test_device_type_bulb(dev):
-    if dev.is_light_strip:
-        pytest.skip("bulb has also lightstrips to test the api")
-    assert dev.device_type == DeviceType.Bulb
-
-
-@plug
-def test_device_type_plug(dev):
-    assert dev.device_type == DeviceType.Plug
-
-
-@lightstrip
-def test_device_type_lightstrip(dev):
-    assert dev.device_type == DeviceType.LightStrip
diff --git a/kasa/tests/test_strip.py b/kasa/tests/test_strip.py
index e7d36f90..e5285acc 100644
--- a/kasa/tests/test_strip.py
+++ b/kasa/tests/test_strip.py
@@ -131,3 +131,11 @@ async def test_all_binary_states(dev):
             # original state map should be restored
             for index, state in dev.is_on.items():
                 assert state == state_map[index]
+
+
+@strip
+def test_children_api(dev):
+    """Test the child device API."""
+    first = dev.children[0]
+    first_by_get_child_device = dev.get_child_device(first.device_id)
+    assert first == first_by_get_child_device