feat: Strom, Leistung und Strombudget

Zeigt strip.current_ma und strip.power_w aus system/info als Sensoren
und macht max_milliamps aus system/settings ueber ein Zahlenfeld
einstellbar. Schreiben liest wie bei sACN zurueck statt den
geschriebenen Wert anzunehmen.

tests/test_strombudget.py

@@ -0,0 +1,66 @@
+"""Strom, Leistung und das Budget."""
+
+from __future__ import annotations
+
+from typing import Any
+from unittest.mock import MagicMock
+
+from freezegun.api import FrozenDateTimeFactory
+from homeassistant.const import ATTR_ENTITY_ID
+from homeassistant.core import HomeAssistant
+from pytest_homeassistant_custom_component.common import MockConfigEntry
+
+from tests.helpers import abfragen, entity_id_for
+
+
+async def test_strom_und_leistung(hass: HomeAssistant, init_integration: MockConfigEntry) -> None:
+    assert hass.states.get(entity_id_for(hass, "sensor", "current")).state == "2500"
+    # power_w kommt als Kommazahl von der Firmware (2,5 A bei 12 V).
+    assert hass.states.get(entity_id_for(hass, "sensor", "power")).state == "30.0"
+
+
+async def test_budget_zeigt_den_eingestellten_wert(
+    hass: HomeAssistant, init_integration: MockConfigEntry
+) -> None:
+    entity_id = entity_id_for(hass, "number", "max_milliamps")
+    assert hass.states.get(entity_id).state == "1800.0"
+    assert hass.states.get(entity_id).attributes["max"] == 65535
+
+
+async def test_budget_setzen(
+    hass: HomeAssistant, init_integration: MockConfigEntry, mock_client: MagicMock
+) -> None:
+    await hass.services.async_call(
+        "number",
+        "set_value",
+        {ATTR_ENTITY_ID: entity_id_for(hass, "number", "max_milliamps"), "value": 9000},
+        blocking=True,
+    )
+    mock_client.set_strip.assert_awaited_once_with(max_milliamps=9000)
+    # Nicht geraten, sondern zurueckgelesen: das Geraet antwortet nur mit "ok".
+    assert mock_client.get_settings.await_count >= 2
+    assert hass.states.get(entity_id_for(hass, "number", "max_milliamps")).state == "9000.0"
+
+
+async def test_ohne_strip_block_in_settings_bleibt_das_budget_leer(
+    hass: HomeAssistant,
+    init_integration: MockConfigEntry,
+    strip_settings: dict[str, Any],
+    freezer: FrozenDateTimeFactory,
+) -> None:
+    """Aeltere Firmware ohne Strommessung meldet unter system/settings keinen strip-Block."""
+    strip_settings.pop("strip")
+    await abfragen(hass, freezer)
+    assert hass.states.get(entity_id_for(hass, "number", "max_milliamps")).state == "unknown"
+
+
+async def test_ohne_strip_block_in_info_bleiben_strom_und_leistung_leer(
+    hass: HomeAssistant,
+    init_integration: MockConfigEntry,
+    strip_info: dict[str, Any],
+    freezer: FrozenDateTimeFactory,
+) -> None:
+    strip_info.pop("strip")
+    await abfragen(hass, freezer)
+    assert hass.states.get(entity_id_for(hass, "sensor", "current")).state == "unknown"
+    assert hass.states.get(entity_id_for(hass, "sensor", "power")).state == "unknown"