Add battery module to smartcam devices (#1452)

tests/smartcam/modules/test_battery.py

@@ -0,0 +1,33 @@
+"""Tests for smartcam battery module."""
+
+from __future__ import annotations
+
+from kasa import Device
+from kasa.smartcam.smartcammodule import SmartCamModule
+
+from ...device_fixtures import parametrize
+
+battery_smartcam = parametrize(
+    "has battery",
+    component_filter="battery",
+    protocol_filter={"SMARTCAM", "SMARTCAM.CHILD"},
+)
+
+
+@battery_smartcam
+async def test_battery(dev: Device):
+    """Test device battery."""
+    battery = dev.modules.get(SmartCamModule.SmartCamBattery)
+    assert battery
+
+    feat_ids = {
+        "battery_level",
+        "battery_low",
+        "battery_temperature",
+        "battery_voltage",
+        "battery_charging",
+    }
+    for feat_id in feat_ids:
+        feat = dev.features.get(feat_id)
+        assert feat
+        assert feat.value is not None