feat: add shared common capabilities

tests/test_common_capabilities.py

@@ -0,0 +1,30 @@
+from samsung_appliance.registry.capabilities import common
+from samsung_appliance.registry.discovery import discover
+
+
+def _reg():
+    return {c.rt: c for c in (
+        common.KIDS_LOCK, common.REMOTE_CONTROL, common.ALARMS,
+        common.ENERGY_METER, common.WATER_METER, common.WATER_FILTER,
+    )}
+
+
+def test_kids_lock_binary_value_fn():
+    desc = common.KIDS_LOCK.entities[0]
+    assert desc.value_fn('Lock') is True
+    assert desc.value_fn('Ready') is False
+
+
+def test_energy_clamps_negative_power(fridge_resources):
+    # instantaneousPower can read negative at idle; must clamp to 0.
+    pw = next(e for e in common.ENERGY_METER.entities if e.key == 'power_watts')
+    assert pw.value_fn(-500.0) == 0.0
+    assert pw.value_fn(93.0) == 93.0
+
+
+def test_common_caps_discover_on_dishwasher(dishwasher_resources):
+    bound = discover(dishwasher_resources, _reg())
+    keys = {b.desc.key for b in bound}
+    assert 'child_lock' in keys
+    assert 'remote_control' in keys
+    assert 'power_watts' in keys