Federate official Belgium data sources

backend/tests/test_sprint227_statbel_population_preflight.py

@@ -205,6 +205,42 @@ def test_preflight_reconciles_spatial_and_unlocated_population(tmp_path: Path) -
     assert len(manifest["schemas"]["geometry_schema_sha256"]) == 64
 
 
+def test_preflight_supports_the_complete_national_scope() -> None:
+    result = PREFLIGHT.validate_statbel_release(
+        year=2025,
+        layout="new",
+        population_content=population_archive(),
+        population_url=POPULATION_URL,
+        geometry_content=geometry_archive(),
+        geometry_url=GEOMETRY_URL,
+        scope=PREFLIGHT.GEOGRAPHIC_SCOPES["belgium"],
+    )
+
+    accounting = result.manifest["scope_accounting"]
+    assert accounting["scope_key"] == "belgium"
+    assert accounting["member_count"] == 2
+    assert accounting["member_nis_codes"] == ["13008", "13025"]
+    assert accounting["spatial_population_total"] == 240
+    assert accounting["unlocated_population_total"] == 3
+    assert accounting["accounted_population_total"] == 243
+
+
+def test_national_preflight_rejects_an_unscoped_baseline(tmp_path: Path) -> None:
+    with pytest.raises(PREFLIGHT.StatbelPreflightError) as exc_info:
+        PREFLIGHT.validate_statbel_release(
+            year=2025,
+            layout="new",
+            population_content=population_archive(),
+            population_url=POPULATION_URL,
+            geometry_content=geometry_archive(),
+            geometry_url=GEOMETRY_URL,
+            scope=PREFLIGHT.GEOGRAPHIC_SCOPES["belgium"],
+            baseline_snapshot=baseline_snapshot(tmp_path / "baseline.geojson"),
+        )
+
+    assert exc_info.value.code == "STATBEL_BASELINE_SCOPE_MISMATCH"
+
+
 def test_preflight_reports_bounded_topology_repairs(tmp_path: Path) -> None:
     result = validate(tmp_path, geometry_content=geometry_archive(repairable_invalid=True))