tests: add type annotations to Smart tests (#1686)

Add type annotations across all 'smart' tests, enabling mypy to check test function bodies, catching type errors that were previously hidden.

tests/smart/modules/test_temperature.py

@@ -1,6 +1,7 @@
 import pytest
 
-from kasa.smart.modules import TemperatureSensor
+from kasa import Module
+from kasa.smart import SmartDevice
 
 from ...device_fixtures import parametrize
 
@@ -23,9 +24,9 @@ temperature_warning = parametrize(
         ("temperature_unit", str),
     ],
 )
-async def test_temperature_features(dev, feature, type):
+async def test_temperature_features(dev: SmartDevice, feature: str, type: type) -> None:
     """Test that features are registered and work as expected."""
-    temp_module: TemperatureSensor = dev.modules["TemperatureSensor"]
+    temp_module = dev.modules[Module.TemperatureSensor]
 
     prop = getattr(temp_module, feature)
     assert isinstance(prop, type)
@@ -36,9 +37,9 @@ async def test_temperature_features(dev, feature, type):
 
 
 @temperature_warning
-async def test_temperature_warning(dev):
+async def test_temperature_warning(dev: SmartDevice) -> None:
     """Test that features are registered and work as expected."""
-    temp_module: TemperatureSensor = dev.modules["TemperatureSensor"]
+    temp_module = dev.modules[Module.TemperatureSensor]
 
     assert hasattr(temp_module, "temperature_warning")
     assert isinstance(temp_module.temperature_warning, bool)