Add support for waterleak sensor (T300) (#876)

kasa/tests/smart/modules/test_waterleak.py

@@ -0,0 +1,42 @@
+from enum import Enum
+
+import pytest
+
+from kasa.smart.modules import WaterleakSensor
+from kasa.tests.device_fixtures import parametrize
+
+waterleak = parametrize(
+    "has waterleak", component_filter="sensor_alarm", protocol_filter={"SMART.CHILD"}
+)
+
+
+@waterleak
+@pytest.mark.parametrize(
+    "feature, type",
+    [
+        ("alert", int),
+        ("status", Enum),
+    ],
+)
+async def test_waterleak_properties(dev, feature, type):
+    """Test that features are registered and work as expected."""
+    waterleak: WaterleakSensor = dev.modules["WaterleakSensor"]
+
+    prop = getattr(waterleak, feature)
+    assert isinstance(prop, type)
+
+    feat = waterleak._module_features[feature]
+    assert feat.value == prop
+    assert isinstance(feat.value, type)
+
+
+@waterleak
+async def test_waterleak_features(dev):
+    """Test waterleak features."""
+    waterleak: WaterleakSensor = dev.modules["WaterleakSensor"]
+
+    assert "water_leak" in dev.features
+    assert dev.features["water_leak"].value == waterleak.status
+
+    assert "water_alert" in dev.features
+    assert dev.features["water_alert"].value == waterleak.alert