FUE-T05: anchor energy-cost HA device identity to active meter (uuid id, label name, empty when none)

tests/test_expose_catalog.py

@@ -205,27 +205,58 @@ def test_register_provider_direct_call():
 def test_build_catalog_empty_with_no_devices(expose_db):
     """build_catalog with no enabled modbus devices must contain no modbus entities.
 
-    The energy_cost provider is always registered and always produces its 6 entities
-    (4 original + 2 daily) regardless of device state, so the catalog will not be empty.
-    This test checks that no *modbus* entities are present when there are no enabled
-    modbus devices.
+    FUE-T05: the energy_cost provider now requires an active electricity meter.
+    Without one, it returns [] and the catalog contains no energy entities.
+    With one, it produces 6 entities.
+
+    This test verifies both cases:
+    1. No modbus devices → no modbus entities.
+    2. No active meter → no energy entities (provider returns []).
+    3. After inserting an active meter → 6 energy entities present.
     """
     from app.integrations.expose import build_catalog
 
+    # Case: no modbus devices, no active meter → catalog is empty.
     with Session(expose_db) as session:
         catalog = build_catalog(session)
 
-    # The modbus provider finds no enabled devices → no modbus entities.
-    # The energy_cost provider always produces 6 entities, so the catalog is non-empty.
     modbus_entities = [e for e in catalog if e.entity.key.startswith("modbus.")]
     assert modbus_entities == [], (
         "Expected no modbus entities when no modbus devices are enabled"
     )
 
-    # The 6 energy_cost entities should always be present (4 original + 2 daily).
-    energy_keys = {e.entity.key for e in catalog if e.entity.key.startswith("energy.")}
-    assert len(energy_keys) == 6, (
-        f"Expected exactly 6 energy_cost entities (4 original + 2 daily), got {energy_keys!r}"
+    # No active electricity meter → energy-cost provider returns [] → no energy entities.
+    energy_keys_no_meter = {e.entity.key for e in catalog if e.entity.key.startswith("energy.")}
+    assert len(energy_keys_no_meter) == 0, (
+        f"Expected 0 energy_cost entities (no active meter), got {energy_keys_no_meter!r}"
+    )
+
+    # Insert an active electricity meter → provider should now produce 6 entities.
+    from datetime import datetime, timezone
+    now = datetime.now(tz=timezone.utc)
+    with Session(expose_db) as session:
+        from app.models.energy import Meter
+        m = Meter(
+            label="Test Meter for catalog",
+            commodity="electricity",
+            started_at=now,
+            ended_at=None,
+            reason="initial",
+            note=None,
+            created_at=now,
+        )
+        session.add(m)
+        session.commit()
+
+    with Session(expose_db) as session:
+        catalog_with_meter = build_catalog(session)
+
+    energy_keys_with_meter = {
+        e.entity.key for e in catalog_with_meter if e.entity.key.startswith("energy.")
+    }
+    assert len(energy_keys_with_meter) == 6, (
+        f"Expected exactly 6 energy_cost entities (4 original + 2 daily) with active meter, "
+        f"got {energy_keys_with_meter!r}"
     )