Add HA lifecycle tests and CI

tests/ha/conftest.py

@@ -0,0 +1,40 @@
+"""Real Home Assistant fixtures, isolated from the offline boundary doubles."""
+from unittest.mock import patch
+
+import pytest
+from homeassistant.core import ServiceRegistry
+from pytest_homeassistant_custom_component.common import MockConfigEntry
+
+
+@pytest.fixture(autouse=True)
+def custom_integrations(enable_custom_integrations):
+    """Let HA discover custom_components/heating_mpc in this checkout."""
+
+
+@pytest.fixture(autouse=True)
+def no_actuator_calls():
+    """Reject every HA service call during all tested observer lifecycle paths."""
+    with patch.object(ServiceRegistry, "async_call", side_effect=AssertionError(
+        "The shadow integration must never call HA services"
+    )) as calls:
+        yield calls
+        calls.assert_not_called()
+
+
+@pytest.fixture
+def entry():
+    return MockConfigEntry(
+        domain="heating_mpc", version=2, unique_id="home_heating",
+        data={"climate_entity": "climate.reference", "heater_entity": "switch.boiler",
+              "room_entities": ["sensor.room"],
+              "outside_temperature_sources": ["sensor.outside"],
+              "weights": {"sensor.room": 1.0}, "horizon_minutes": 60},
+    )
+
+
+@pytest.fixture
+def inputs(hass):
+    hass.states.async_set("sensor.room", "20", {"unit_of_measurement": "°C"})
+    hass.states.async_set("sensor.outside", "5", {"unit_of_measurement": "°C"})
+    hass.states.async_set("switch.boiler", "off")
+    hass.states.async_set("climate.reference", "heat", {"temperature": 22, "preset_mode": "comfort"})