feat(ml,backend): implemente le service de scoring et GET /predictions (#37)

apps/backend/tests/api/test_predictions.py

@@ -0,0 +1,82 @@
+from collections.abc import Callable, Iterator
+from datetime import UTC, datetime
+from uuid import uuid4
+
+import pytest
+from fastapi import FastAPI
+from httpx import AsyncClient
+
+from app.api.deps import get_current_principal, get_prediction_service
+from app.core.principal import Principal
+from app.core.roles import AccountKind, Role
+from app.services.prediction import PredictionSummary, SitePrediction, SitePredictionSummary
+
+TARGET_AT = datetime(2026, 9, 16, 13, 0, tzinfo=UTC)
+CREATED_AT = datetime(2026, 9, 16, 12, 0, tzinfo=UTC)
+
+
+def principal(role: Role = Role.LECTEUR) -> Principal:
+    return Principal(
+        id=uuid4(),
+        email=f"{role.value}@enervision.fr",
+        role=role,
+        kind=AccountKind.HUMAIN,
+        must_change_password=False,
+    )
+
+
+class FauxService:
+    def __init__(self) -> None:
+        self.resume = PredictionSummary(
+            timestamp=datetime.now(UTC),
+            sites=[
+                SitePredictionSummary(
+                    site_id="SITE001",
+                    site_name="Bureau Paris La Défense",
+                    prediction=SitePrediction(
+                        target_at=TARGET_AT,
+                        target_metric="consumption_kwh",
+                        period_minutes=60,
+                        predicted_value=812.5,
+                        status="available",
+                        failure_reason=None,
+                        model_reference="lightgbm-abc123",
+                        created_at=CREATED_AT,
+                    ),
+                ),
+                SitePredictionSummary(site_id="SITE002", site_name="Usine Lyon", prediction=None),
+            ],
+        )
+
+    async def summary(self) -> PredictionSummary:
+        return self.resume
+
+
+@pytest.fixture
+def servi(app: FastAPI) -> Iterator[Callable[[], FauxService]]:
+    def installe() -> FauxService:
+        service = FauxService()
+        app.dependency_overrides[get_prediction_service] = lambda: service
+        app.dependency_overrides[get_current_principal] = lambda: principal()
+        return service
+
+    yield installe
+    app.dependency_overrides.pop(get_prediction_service, None)
+    app.dependency_overrides.pop(get_current_principal, None)
+
+
+async def test_get_predictions_returns_the_service_result(
+    servi: Callable[[], FauxService], client: AsyncClient
+) -> None:
+    servi()
+
+    response = await client.get("/api/v1/predictions")
+
+    assert response.status_code == 200
+    corps = response.json()
+    premier, second = corps["sites"]
+    assert premier["site_id"] == "SITE001"
+    assert premier["prediction"]["predicted_value"] == 812.5
+    assert premier["prediction"]["status"] == "available"
+    assert second["site_id"] == "SITE002"
+    assert second["prediction"] is None